Although I have not got to this point in finishing any of my airplanes yet I do like Handgliders technique very much...You mention you ended up using allot more microballoons which is a really good thing!! More microballoons means less resin which in turn means less weight...

When the time comes I thought I would attempt weighing my cloth and used exactly that same weight of resin hoping to achieve a 50/50 cloth to resin ratio...I'll probably have to experiment on some test panels just to see what that "looks like"...Ultimatly I would like to cut that back a little more than 50/50 if I feel I can get the cloth wet out sufficiently...I know of pre-preg materials that are along the lines of 38% resin to 62% cloth...It's a little tougher to achieve the ultimate resin/cloth ratio while doing a wet lay-up process...

Not sure until I start monkeying with it if my mental picture of how things will work is valid...I may find that you need that extra resin to bind the microballoons together?? I don't know...Although I have allot of composite experience this will be different than what I'm use to doing...It should be pretty fun...

Your plane is looking good and look forward to the rest of the finishing stages...

Chuck

P.S. I think it's already been mentioned but be sure to where a respirator when using microballoons!! Or any of the other common fillers such as silica, flox, graphite powder ect...