I have seen a few built and other than filling typical seams, etc, seems to build up fine. I would most likley modify the sidecar with a cheesecake-filling-firing gun with cheesecake tank on the back.
As a W/ G fan, I would jump right into it myself. Theres lots of reference on W/ G on the net, so paint shouldn't be a problem, and there aren't many rules.
Additional cheese (or as Wallace says, CHEEEEEEEEEEEEEEEEEEEESE) is always a good thing!
David
Build to please yourself, and don't worry about what others think!
TI 4019 Jolly Roger Squadron, 501st Legion