My estimate is that 'glass and paint would add 2 or more pounds to final weight. I base this on what I have seen. I have built 3 Top Flite Corsairs, each one finished with iron on covering, as well Robart retracts with RoboStruts equipped, and each one came in under 9 lbs. I have met others with simular results. I have also met others who went the 'glass and paint route, and each one of theirs ended up OVER 11 lbs. NOW, I truely believe that a 'glassed and painted one could be built which would be lighter than the ones I have seen, I just haven't seen one yet. If you consider yourself an accomplished/ skilled builder, capable of doing a better job than most others, then maybe you can keep the weight down to the level of the iron on covered ones. Check my gallery for pics of 2 of my Top Flight Corsairs which are covered with iron on covering. #167 weighs 8 lbs, 10 oz without fuel. It has full Robarts and flaps.