Take a couple pieces of 1/2 inch delrin, width of seat by 3 inches and mount em, one across the front legs and one across the back legs, side to side. Use stainless flathead sex bolts to mount em and glue some 1/8" rubber on the bottom. On the front one you now can mount a nice stainless hinge and put a latch on the rear piece. Now you can just unlatch it, tilt seat forwad and open hatch!