You're right, Bobby. Flat bottom, 25" diameter. I have a welder (friend) and a sheet of 3/32 on the 5/32 perforated on McMaster-Carr lined up. Just wanted to see what folks thought of the standoffs.
So, you're suggesting just the nuts? I was going to go with 1" off the bottom, so I may have to use some s/s screws tacked to the bottom of the material.