I think this is the plan along with some 1/16" thick Neoprene rubber strips. I think 120lb zip ties will work fine and hold it nice and tight yet still easily removable. Thank you guys!Ty-wraps to bind notched keepers to the bed board... with some small thickness foam to soak up rattles and squeaks... speaking of 120, 150, 200lb strength cable ties (Example).
NOTE: Beware snipping tails of nylon straps with wire cutters etc. as it leaves a 'pinched' sharp as a scalpel fin lurking just waiting for scalps, back of hands blah blah; a slow & square chop with utility razor as close to lock knuckle as possible safes that hazard. I mention this as I look at the lacey henna-ish or tribal scarification designs all over my arms as my Florida tan fades being back in MN, a hazard of working crowded industrial control packages with 100's of cable ties used willy-nilly.