Sorry to hear about that injury, Don. That's no fun.
Planning your shop is fun, however! If it were me, I'd start thinking about two things: storage and tools (and the placement of both). Cruise around the
Container Store website, and then maybe contemplate the kinds of tools you'd need for bike work that'll require bench space, e.g., a bench grinder, vise (two are ideal), etc. Then figure out the placement of all of that stuff.
Neal