Indeed... it has some heft to it! Even more so now with the top panel installed. I guess I'll have to go buy a couple of bathroom scales just to weigh the thing.
Made a little more progress tonight. Caulked some seams, stuffed five 20 ounce bags of polyfil into the box, installed the speaker posts/terminals, and glued the top panel on. I'll probably get another bag of polyfil in there before all is said and done.
Here's a "dumb question" for you guys: you know how speaker wire has a stripe on one of the conductors? Are you supposed to connect that striped side to positive or negative? Is there an official "right" way or convention one should follow? My knee jerk reaction is always to use the striped wire for positive.