That's a brasso'd canopy from the UCS Tie Fighter. It looks like CRAP in the stock configuration, but when you Brasso off all the hokey looking gray printing on it, it looks really fantastic! This set was on sale at TRU a while back for $80 or (...) (24 years ago, 25-Feb-01, to lugnet.build, lugnet.build.arch, lugnet.town)
This is my latest building: (URL) can also look at the raw photos on Brickshelf: (URL) is probably one of my strangest structures yet. LMKWYT (24 years ago, 25-Feb-01, to lugnet.build, lugnet.build.arch, lugnet.town)