Okay, I got sidetracked and ran out of time. I cut out a shelf from 7/16" sheathing and covered it with black vinyl. Not worth posting a photo BUT it will meet the immediate need for this trip. Sorry for not getting it done as stated in my earlier post(s).
While I was beating myself up for waiting until the last minute, etc., etc., I did look at the offerings by Smillybuilt and others. Very Jeep oriented but more than my budget. So I also ran across "... truck under bed tool/storage boxes..." and wondered if anyone has bolted/attached one to the floor and let the locked tailgate cover the lock???? Somewhat cheaper - just wondering.