I'm talking about this style:
library-rolling-stack-shelving-compact-book-stacks.jpg
I think it could be a fun project and a neat way to save a small amount of space in my shop. I'll probably only have about 4 racks, so the space savings will be small, but the "gizmo factor" is off the charts
I think it would be pretty easy to do with some standard shelves on some fixed casters, then adding a dual rack and pinion so the whole thing doesn't twist. Slap a handwheel at about waist height and connect to the rack and gear near the floor, and there ya go.
You'd have to worry about debris getting caught in the mechanism of course.
Has anyone seen a DIY version of something like this?