Heeehee, it wasn't too long to keep my attention.

I personally put my two playpen babies in one room and the toddler (in a bed) in another. I would put them all together, but the toddler likes to get out of bed if there are distractions in the room with her. I think the kids could all get used to sleeping in the same room given a little time, but like you said, there may be some shuffling going on as you realize their limitations.

The idea of putting y our own two in the basement seems like it would work best from my perspective. However you do it, good luck, and let us know how it goes.