Panniers.

[sinto607276]

Couple bits of metal, plastic, and screws £400 bargain?

I bet I could get a custom rack made for less than that alternatively I could make an FZ6 rack fit it.

Ingenious bits of metal,  you can remove most of it so it doesn't show when you don't have the panniers on.
Bits of plastic are actually molded and doubt you could make them, but I'm sure you could get something fabricated but not at that price so your best option from what your saying is to make your FZ6 rack fit.
Good luck with that fella :-)