from Marvin on rc-monster forum when asked what the weight was RTR:
weight (without bodyshell) is 3360g
so about 7.41lbs according to google.
electronics he is using:
A Medusa 36-60-2000 motor (doesn't look like there's much room for anything longer, a 70 maybe...)
-CC MMM V3
-Flightpower Evo 25 4350mAh 4S
-Futaba BLS-451
-Spektrum DX3R + Receiver