The drive housings (all external) for TRS80 model 1
will handle long
drives. Many of the after-market ones are not worthy of preservation.
I've seen several 2-drive boxes with built-in PSUs. There were random 3rd
party ones for the BBC micro which might not be worth preserving, and I
also have one for the Sharp MZ80B and and one for the Zneith Z90 (and I
asusme the related Heathkit machines) which prsuambly are.
If you come across generic thigns like that, they might be suitable cases
too.
-tony