This is a picture of the RCI aluminum seat I am using. It is 0.125 thick, 33 inches tall, and 19 inches wide at the butt. I have a large one, butt, that is. It will be covered in some sort of padded vinyl that I'll get later. Maybe color cordinated with the exterior paint? My plan is to lay it back as far as possible to get my head as low as possible. It will fit in the Alpine seat track location, down low and be braced to the roll cage cross bracing and wheel tub. The safety harness used will be full six point - I do not want to get thrown out of this sucker in case of a roll over at speed! Arm restraints are also required to keep one extremities from flailing about during a mishap.