It's a 10' sheet, I'll be putting another piece behind this one. I had the edges bent at a shop, I would never have got it bent very nicely at all. Think it's 10 gauge if I remember correctly.
The edges will be completely welded as well as spots on the cross members. If you look closely you may see that I cut holes to line up with the cross members that I will plug weld.
I wasn't going to cut any holes for water drain, don't think it'll be much of an issue. I hope to have/make some sort of cover for the top, keep snow and stuff out; less need to tie everything down as well.
Kinda like the swimming pool idea, would have been nice this summer