Did a bit more research on this kit, I found an old build report from a bloke in Switzerland. He sanded the whole thing down to remove the panel-lines and the rivets. He reckons raised rivet detail on the kit were all the rage in the 70's, and like the fashion of those times was a bit over the top! Plus they weren't that prominent on the real thing, so I'm going with a complete wet sand and rescribe on this bird. Just waiting on a scriber I ordered to come.
I'm not having much luck finding the PE detail set for this so it looks like any interior detail will have to be scratchbuilt. I think I might invest in a set of those really small files Dr. Wojtek has for his plastic surgery.