@mundanewarrior, I’m sorry my post was unclear. Yes, my daughter entered with 41 credits, so was a Sophomore by hours when she entered. Due to those AP/CLEP hours, she was technically a Junior when she interviewed for co-ops during her 3rd semester on campus. But, she was really more of a sophomore in the CS sequence . . . I hope that makes more sense now.
I agree that it is not impossible to graduate from CS in 6 semesters. My dd could have done it if she’d really wanted to, lol. Instead she added a 2nd major (math) and also takes a lot of music courses (she plays harp). (She has 10 semesters of scholarship money, so she can/will still do a MS with the last 2 semesters. If she hadn’t had the typical 8 semesters, I’d have encouraged her to consider jamming through so she could get her BS & MS within 8 semesters.) If you have studied the flowchart and are meticulous about understanding pre-reqs, etc, it is very feasible. Just be sure to get CS100 in your first semester and go from there. The most difficult aspect of graduating in 6 semesters is that you have to have CS100/101/200/201 plus a couple ECE courses all done before you can take any of the upper division CS courses. So, you’d have to pack all the last 4 semesters of the flowchart’s CS courses into 2 semesters. That’s technically possible, I guess, but would be pretty high pressure. One thing to consider if you want to do that is that 200 & 201 do not have to be taken in sequence. You can take 200 & 201 at the same time, so presumably in Semester 3 of your 6 semester plan. Note, however, that I’m not sure you can jam in both the required ECE courses into the first 3 semesters, and those, too, are required before taking any of the upper division CE courses, I believe. Study that flow chart, and you can likely be OK.
Oh, also, if you are interested in a MS, consider the University Scholars option . . . you could use all 8 semesters and get both the BS & MS, and the University Scholars program makes that a bit easier to do time-wise.
Be aware that taking 5 CS/ECE/similar courses in a semester could be pretty overwhelming. If you already have all your “easy” general ed courses taken care of, then the remaining CS/etc courses may be a lot tougher . . . The typical 8 semester plan has you taking maybe 2-3 CS/similar “hard” courses per semester along with 2 or so easier “softer” courses. . . Replace all those easier courses with an equal number of hard courses could get out of hand hard. For my daughter’s course planning, she’s been able to keep it at about 2 CS and/or ECE courses per semester, about 1-2 math courses (her 2nd major, but these courses are quite a bit easier for my daughter, as she’s very math-y), along with 2-3 credits of music, etc. I would personally be very nervous about her taking 4-5 CS courses in one semester, but who knows, maybe the upper division courses aren’t as intense as the 100-200 courses . . . I guess we’ll find out later, lol.
Also note, not all upper div CE courses will be offered both Fall and Spring terms – so watch out for that. You can check the course catalog for recent semesters to identify which courses are offered only one term. It’s not too many, and I’m not aware of a list, but someone might have a handy list somewhere. . .
Also, note that 201 is generally considered a “killer” course. 200 isn’t too tough, comparatively, but 201 is a killer. Many good students struggle to pass, let alone to get a good grade. Taking both together is do-able but requires a serious time commitment. You’ll understand by the time you get to that point . . .
Many students can’t pass 100, 101, and/or 201 on their first try. Take them very seriously and allow a lot of time for each if you want to be sure to pass on the first go. Also, your first semester or two, be sure to also include one or two easy-A courses in your schedule to make it easier to keep your GPA up if you end up with a bad grade in a class . . .
Yep, my daughter accepted a co-op offer at Nucor. She starts work in May. It was her first choice, and she was thrilled. I’d rather not share more of her personal details/offers/etc, but I will say that many talented students don’t get any offers on their first try at co-op, but it seems that many/most get at least one offer within one cycle, and that they can try and try again!! Dd only did the co-op process that one time (her 3rd semester on campus, technically JR status), but many of her friends tried the first time during their 2nd semester on campus. None of them accepted offers who interviewed during their 2nd semester. MANY of them accepted offers from the co-op process during Semester 3. I am guessing that companies prefer to hire 3rd semester students compared to 2nd semester (which makes sense to me from a hiring perspective.) Some of them started work right away, in Semester 4 . . . while my dd is starting this summer – which was her preference. She wasn’t willing to start during Spring due to her desire to take a high-stakes CS course – 201 – with her CS buddies/study-mates that term. When you apply for co-ops, you indicate which semester(s) you are willing to start work . . . So, my best advice would be that if you’re interested in co-op’ing, try in Semester 2. If you don’t accept an offer then, try again in Semester 3. I don’t know how much longer you can keep trying (but at least through Semester 4, I am pretty sure) if you haven’t yet matched, but by then, you’ll know yourself!!
The co-op offers for 2nd interviews and/or job offers tend to dribble in over weeks to months, not all at the same time, so good manners would be to withdraw interest from other companies once an offer is accepted. I know that some students drag it out (delaying answering offers, etc.) trying to get as many offers as possible even w/o the intention to consider later offers (if they’d already gotten one from their favorite), but my daughter does not / did not do things like that. She promptly accepted once she had the offer she wanted . . . and she then stopped interviewing / let the other companies know . . .
So far as housing commitments, it is true that many kids commit to apartment leases in fall for the FOLLOWING year. This is more common with girls than boys, but it happens a lot. The vast majority of students have a commitment to a lease by January or so. The housing issue wasn’t a factor for my daughter, but she did have a strong preference to stay in Tuscaloosa. She considered options outside of Tuscaloosa, but I don’t know that she would have accepted a co-op if it hadn’t been in Tuscaloosa. It certainly would have made it more expensive and logistically challenging. 
She loved the people she interviewed with at Nucor and is excited about the work opportunity. The location is definitely a bonus. I’d suggest that if you are planning on trying for co-op, try to delay committing to housing until after the co-op interview process is complete (or as long as you can).
So far as using the scholarship money for summers, as far as I’ve heard, you could/would be able to get the entire semester’s worth of $$ towards a summer abroad. And, I have heard no reason why you can’t do that twice. (You’ll have to work one summer if you get a co-op, though).