Hi Dave
Ive took route 1 (as in Robs e-mail). It is possible with some jiggerypokery and QB Carbon do a good seat mould. Here is my finished article. Have attached a few shots of the job in progress !
Some notes
Be sure to fit some heat shrink plastic or foam to the subframe pins that the srada side panels fit on to or they will pierce a nice hole in your freshly painted seat unit (as I found out to my cost !!)
The QB mould has 'desmoquattro' moulded in to it so you will need to sand that out (probably from a moulding of an SP4 seat which had a sticker there)
Ive probably got some OE from and rear seat pads coming over in the next few weeks from italy - give us a shout then !
The long dzus fastener that secures the bum pad is still available from dealers - about £8.
Cut your self a big hole in the seat unit behind the bum pad (see attached pic) so you can still use the underseat storage !
Cheers
Nat