That's very cool. Those two planes you mentioned are the only other ones I've found and I've been seriously considering them as well, but I think they are a little bigger and pricier than the Sopwith, which isn't really a huge problem. And they will take a Zenoah G26 too which is also tempting.

And it's not the sound of the glow engine that I have a problem with, it's the oil mess. Believe me, the sound of my Saito .82 put big smiles on my face every time I flew it. There's nothing quite like the sound of a Saito.