For anyone who isn't familiar with 1/2A building techniques, and typical wood sizes, have a look at the "DAS NOT UGLY" and similar build threads to see how lightness and adequate strength is acheived. If all a guy has ever been exposed to is .40 sized kits, then it takes quite a shifting of gears mentally to know when enough is enough for 1/2A planes. After seeing even the most extremely stressed 1/2A planes hold up to engineering that omits doublers, formers, braces, and sometimes even spars, it's safe to say that it is way more difficult to build too light than visa-versa. Having access to select grade [4 to 6 pound] wood is essential. A 210 sq" model with a simple design will easily come in at 14 ozs with 1/2A power. The HALFWIT is another design to glean ideas from, even though it is a profile, it is a great example of how to build in generous wing area, run 4 channels and have the whole thing weigh 13 ozs.