I realised that the seat would need to be replaced, and I liked the idea of a rear seat-hump. I also had an idea that creating an angled one would be an interesting project. In the event, I needed also to make this integrate with the rear mud-guard arrangement, and it also had to accommodate the rear light and brake light.
I build a mock-up from card; flat pieces, held together with sticky tape. Then, I built if for real, using thin plywood and fibre-glass to stick it together. I used a 2-part polyester filler (Isopon P38) to cover all of this, and I spend several afternoons sanding it to the right shape and smoothness. Eventually, I cut down the old rear mudguard (which was just a piece of plastic), and attached my new seat hump to it. Then I applied more filler and after sanding it looked more-or-less ready to paint.
It doesn’t seem much in the writing, but this was an awful lot of work, and there was many design aspects that made it more complex. How, for example. to you facilitate the wiring for the rear and brake lights, even if the fitting is simple and elegant? How do you fasten the light neatly? How to you fasten the whole lot to the motorcycle?
I’m not too displeased with how it all turned out. It was an awful lot of work, though, and the painting is a disaster; it needs to be re-painted.
This picture shows the rear seat hump in all its glory.