BB1 The floor concrete issue with the base was my only question at this point. I think I have figured that out with leveling feet - just ordered some that I hope will work.
Try to find some cheap vinyl floor tiles and put them underneath.
For our barn and shop concrete floors, I have brushed Thompson's Waterseal on the concrete and it stopped any moisture coming up. It can also be sprayed on.
"Duck and Bob would be out doin some farming with funny hats on." chrisstef