Resin/bead in a Prosport / PR6

[Dibba]

Has anyone here ever made a resin / bead or foam seat for a Prosport / PR6 ?

If so I would be very interested in a photo if possible please or information upon how the upper part of the seat and shoulder area was supported ?

Many thanks in advance for any help.

Steve

[Dibba]

Very many thanks indeed for taking the time to provide such a comprehensive reply and useful information.