That sounds interesting.

I was thinking of using a big old PC server-type tower case with a new aluminium front plate (making a nice engraved one might be the machine's first job) to hold all the drive electrics. Has several cooling fans already mounted which is handy, and plenty of space (if I go with my PC PSU power supply it will be bulkier than Roy's). But the internal dividers/drive trays etc in some PC cases can be a bugger to cut out/work around.

I've used this type of box before for VFD installations etc:

Enclosure on Ebay

and that's another option.