My MC18 2J has a nice thick folder full of reciepts. I couldn't even begin to say how much I've spent!
I would say any MC18 under 2K will probably have need or have repaired panels.
All bodywork and major parts are getting very rare in the UK now. It's weird though that more MC16 stuff is sold on eBay than any other model.
IMO all NSRs are now in the classic realm where it's either luck or cost for parts. Check out David Silvers and try some random part no's from the parts manual
If you are thinking of running a track day bike, it probably doesn't matter about the panels. Just get the fibreglass out and patch it up.
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Why do things simply when you can complicate them