Are those barebones or just laptops with nothing in them? The only true barebones laptops I've seen have been the ECS desknote series. They run on standard desktop RAM, socketA processors, and have an easilly accessable 2.5" harddrive. The LCD and optical drive is also easy to swap, but not quite as simple as the others...
The main drawbacks are heat(beleive me, mine is increadibly hot) and lack of batteries. Performace isn't that bad though...