Think this should be in the MK1 section, you'll get as much help as possible in there.
OEM panels are getting very hard to find, especially at a sensible price. When I originally needed a replacement wing for mine I waited for a decent second hand one (ebay). Pattern panels are still kicking about but I would try and avoid these if possible.
After a long wait I did eventually get my hands on a pair of unused OEM wings from someone who had them stored for years but never used, I won't be letting go of these any time soon!
What shell is it, series 1 or 2?... what model was it?
Engine wise, what do you want from it as practically any golf engine from many MKs can be fitted with a bit of work?