Hello, happy bike world -- 
As things slow down in the winter, out (newish) shop is looking to build some additional work areas in anticipation for the next season. I'm hoping to crowd-source some of the creative genius here...
The problem: the tool boards have to be able to be covered & locked up, as a number of other groups use our space (a church basement) for access and storage, often forgetting to lock the door that leads into our bikey dungeon.

Bear with me, if you will: we currently have one main workstation, with a 4x8 toolboard (with a 2x4 frame built out around it) covered by a 4x8 hinged plywood sheet that swings up to the ceiling. The sheet has small slots in it that match up with heavy metal U-shaped hooks in the 2x4 frame, which we then lock with our old Yellow Bike locks. This works pretty well, but creates an annoying problem where we can't put anything tall (i.e., a truing stand) on the table in front of the tools because the swinging board won't close.

We want to build two additional workstations that:
a) will only have a basic allen key / metric wrench set on the board, and will therefore be a lot smaller (a 48"x18" toolboard, perhaps?)
c) will preferably be on four legs & not have to screw into a wall for support (i.e., reasonably mobile)
and most importantly:
d) will have some sort of cheap, simple, and easily opened locking solution to cover the tool board. (I'm think something that would slide maybe?)

Ideas? Need clarification? Let me know.
Thanks!
Clifford McCarten
Director, B!ke: The Peterborough Community Bike Shop
400 Wolfe St
Peterborough, Ontario
(705) 745-2103