notice the square pieces on the closest piece. that is how im going to put my seats and battery box in. it has 3/8" stainless steel t-nuts with scew screw holes on the round base. taped off the hole in the t-nut and drilled a 1" hole halfway through the piece of wood. then i put a thick epoxy with fibers on the bottom of the pieces and filled the hole, then pressed them over the t-nut. also notice the bracing on the middle piece. for the pedestal seats, ski locker, and table.