Someone asked how I weather my On30 high side gons. Here is a photo tutorial of ones I did today http://s1381.photobucket.com/user/ClinchValley/library/Weathering?sort=2&page=1
VERY interesting. I see you are doing it all before assembly. I've always done mine afterward. I need to give your method a try. Do you need to do any touch-up after assembly?