Here's something I dreamed up a while ago:
A vertical storage system with 3 foot deep by
4 foot wide "shelves" mounted on a kind of chain
driven circular elevator. I got the idea from
some pictures of a car parking facility. The
shelf at the I/O position could slide onto a cart
which could then take it to a workstation where
it would lock in. I figure about 2 feet of
clearance between shelves and the whole system
being about 50 feet tall (or down into the floor)
so you could have 50 systems easily ready to use,
demo or work on.