im looking to reproduce a rear wing/spoiler for a vw that is no longer being
made (rear spoiler for the vw mk1 cabriolet).  i have found an original  but
the owner doesnt want to sell it, tho he has granted permission for me to make
a copy.  the spoiler is not mounted, and is a black rubber/foam type spoiler
like those used on the A2 jetta or audi 4000q, and looks similar.    i was
thinking of reproducing it.. the finished product does not have to be done in
rubber/foam, it can be done in plastic or fiberglass, whichever is easier to work
with.  what is the best way to make a mold, without damaging the original?
and what is the best bedium to cast it in?  fiberglass?   anyone have any
experience with this?

thanks

chris