Ok, I've decided on getting a seat from Benji's, and leaving it at that.
I'll make the rear hoop and battery box to put under the seat myself.
As for the fuel tank, I think I will keep the stocker, and wack in some knee dents.
The tank isn't quite the same round shape as benjis one, but It'll do.
Once I've got the seat, I can cut the frame, make the hoop, weld it on and get it sandblasted and powder coated......then I can start putting it all back together again.
The engine will have to wait until I sell my lathe.... I need some room, I've got an area of about 2m x 1.5m to work in.