Thank you Will !
I'm not aiming for a specific weight, as long as it will be under 5kg i'll be happy. It's a very large plane and i built it entirely with 100kg/m3 (or 6.25 lb/ ft3) balsa. I've seen other builders using significantly lighter balsa sheets, so it is possible to achieve better weights for all parts.

Weights of the finished parts are as follows:

fuselage (without canopy, cowl, paint or film covering): 900g
wings (without film covering, servo, control horn, linkage): 265g each
stabs (without film covering, servo, control horn, linkage): 70g each
rudder (without film covering, control horns): 62g

More weight reduction can be achieved by hollowing the balsa tips of the wings, stabs and the large balsa block at the bottom of the rudder. I was too lazy to do that