The seat base was formed of 9mm plywood, as was the "skeleton" for the hump. The infill between the ribs was made from polyester foam cut (similar to the sort of foam used to stick flowers in) into 2" wide slats and glued in with wood glue. The profile for the seat was determined by eye, I wanted something that looked like the 1967 Honda 500 4 ridden by Mike Hailwood from the side view but was wider at the rear end to accommodate an LED rear light/indicator assembly sitting almost unnoticed underneath the base of the hump.
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