but I clearly remember building several Guillows's kits that had plans for "tailwagger" rc using an .020 Cox glow engine .
So if you take your free flight design and reprint your instructions on how to convert it for RC, then they become an RC company instead of free flight?
Not in my book, but it might in the OP's book so good to note. Not to disparage Guillows, their kits are very enjoyable to build, and if you don't get one of the heavy one's, (very likely), they fly well.