I'm assemblying now.
I weighted each major part: in grams
Fuse 955
R-Wing 404
L-Wing 391
Hatch 102
Cowl 269
Elevators 184
Rudder 76
LandingG 235
Motor Mount 70
==================
Total 2686

Looks like finishing weight will be 4.4Kg (9.7lb) with YS140 & Slimline Pitts muffler. I didn't weigh wheel pants.
Quality of the plane looks pretty good, but hardware comes with are cheapy.

I'm having problem with mounting motor. Book is not that great. Book is telling me 165mm from fire wall (not engine box) to prop washer, but that leaves very short engine.
If I do 165mm from back of motor mount, the motor mount is too short to have 4 bolts for engine.
I think I can do 160mm. Can somebody measure what the distance from prop drive washer to back of engine mount?

Thanks.

Nob Muraki