http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCBXL&P=ML
It seems to me that 1650 grams for pretty much a skeleton chassis is very heavy.
Consider another example, the DEX210 RTR, also from Tower, which includes a motor & ESC, radio components--everything but a battery--but is listed at 1567 grams.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCLZD**&P=ML
So when you see a weight listed for a given kit or chassis, what does that typically include?