Used one sheet of 1/2 in ply to build two sections of a French cleat system.
Then scrap ply for various hangers, none custom, but generic mix of holders, thought it would be quicker and take less thought. A snap of the under cabinet one, will install this week with the last cabinet.
Ran out of 1/4 in dowel, always something.
-- Trying, but lots to learn.....