Duane, Actually I thought I would use the lumber supplied with the kit for the first build and on a later build go for the lightest stuff I can find. That way a possible comparison between different weight Simlas can be made assuming all else is the same(ie-engines, radios, building techniques, etc.). And then there is the clipped wing version, and light weight/small engine versions. Hmmmmmmmmmmmmmmmmmmmmm.