Left the bottom unsnapped, used the pipe sockets to hang the canvas, and the snap buckles on each side to keep it in place.
If I recall correctly, the outer most deck snaps could still be used....
I bought one of the very first tdbs' sold... in 1984, or 85.
Gunned out of it for well over 30 years.... none of my pictures are on a computer, or digitized. Lol....