This system includes a 3d file (sorry I didn't clean it up, don't critique my modeling!)  The last design has a locking groove to lock the hooks in place.  It works really really well.

All you need is a ¾" plywood cleat with a 45 deg cut on one end and a groove cut on the other end.  I modeled it based on my cleats but there should be a parameter to change the cleat width.  Mine was roughly 3" or slightly under.

Please make more hook types, I want to see what ideas everyone else has.  Currently I have:

• Battery holders (millwaukee / hilti)
• standard hooks with different widths
• coat hook
• chainsaw hook
• single low profile hooks (for ladders)
• cross country ski hooks and pole holders (haven't posted these yet)

Ideas and alternates for locking groove

The ¼" groove is easy to mill with a table saw or router, but you may wish to use a 45 deg slot (triangular) to eliminate supports on this piece.  Please community, make this better than what I have.