IMHO the drive part will be the hardest to make. I started a 1/6 set but stopped once Bates came out with the 1/5 plans and Robart made the gear. There are several builds on RCSB. The Bates is a very honest bird to fly. I have heard about Darrell making a 1/5 set but can not hold my breath that long[
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Scott P's 1/4 flys extremely well with a Moki. Fantastic presence in the air.