Screws have far more holding power than nails do, and added with the holding power of the glue you used you should be fine. I'm sure that it weighs a ton. Personally I would have built it in the room it was going in. A hand truck/dolly will make it much easier. If you don't have one/can't get ahold of one 4 guys should be able to get it up. I wouldn't try it with only 2.