Just finished mine and it weighs in at 1637 gr.
One thing I notice is that when the front arm is lifted the steering arm 320124-12 is bending slightly. Compared to the rest of the car it does seem a little flimsy. I guess an alu option will be around the corner.
Otherwise I'm really happy with the car, the shell gives plenty of room and everything fits in so easilly.
I've pre ordered two battery retainer replacement blocks from Noel at Cream Extreme. They are made from stainless steel and each weigh 24g (£10 each and £18 pair). An easy way to tune in a little weight if needed.