I made this change in my previous car, a 4/4 from Leather covered to a Walnut one --- I wrestled with designs and materials for the middle instruments bit for weeks and having mocked up a number of things eventually went for just swapping out the panel from the leather one.
I think it turned out fine and was in keeping with the rest of the car -- see
http://www.pbase.com/rsyme/96d62344The best thing I did was replacing the plastic warning light cluster with a stainless "tree" - really smartened up the dash
Good luck with the transfer - remember to label EVERYTHING as you dismantle the current dash - don't ask why I think this is vital!!!!!!!!!!
Cheers!