In these pics. I've tried to show how i built the floor, The reason for the inset on the floor is to set the side walls down 1" so i have 2 ways to mount them and to help with sealing water out.
The 2 x 4's were cut in a lap joint and i saturated them with glue and 3 ss screws.
The plywood is 1" with 1/8" laminate on 1 side, we've had a bunch of this laying outside for more than 3 years and didn't de-laminate so i figured it was plenty good enough to use for my floor.
Tonight i'm going to tar the underside of the floor and bolt it to the frame and then the sides will go up.!!!!!!!
Well that's it for now, I'll post more soon.