just FYI i'd grab some 400wet, and wet-sand all the scratch marks from the 320 out, and then prime the body work areas wet (and whole car) to see if it's ready for paint. 2,000 is super fine. you will run into flaking, and spider cracks. the best way would be 320-400 dry, then prime, then 600wet, then spray.
if you use bondo make sure it dries fully because bondo sucks, and absorbs water..... i'd recommend all-metal which is like $30/qt, but it isn't fun to sand especially with 320grit....
if i get some free time ill try to cruise by and help.