Yep, I'm assuming the heavily-engineered case is going to cause problems for just trying to plop in whatever I want - even if I can cram it in, I wouldn't want

Yep, I'm assuming the heavily-engineered case is going to cause problems for just trying to plop in whatever I want - even if I can cram it in, I wouldn't want to introduce heat issues that they've designed around. Maybe towards the end of its life I'll crack it open and see how I can hack at it, though!