I've been thinking about a few things. What does a ZDZ 40 weigh? I highly dought I'd stick a 40cc engine on that plan, but it's fun to think about! How is the ignition on the MVVS VS the RCS? I think I'm just going to go with an inverted pitts muffler and use some kind of cowl. I really like Wonderufwade's toilet bowl scrubber cowl idea and might put that to use. As far as the engines go, do you think I'd have trouble putting an 8 ounce tank on the CG and also using a 2 ounce header tank? I like the idea of a header tank because I can completely drain the main tank without getting air to the engine.