HW's 1963 Dart GT race car build.

me and about 4 friends worked on the car sanding with 40 grit stripping paint. also took a hammer and chisel to some bondo around the rear window opening and sail panel.... now im.... well i dont know. it looks like the car had a roof put on it... and it was not done well at all. im confused as to why it would have had a roof put on it because it is rust free on the underside. only thing i can think of is it was wrecked... the roof is held on with rivets, screws, bolts, welds and almost an inch of filler... there is still alot of crap and filler to pick off all around the car. i have no clue what to do. kinda upset.