I started building this plane about 6 years ago. I always thought the Zenair 701 was a good ultralight so I drew my interpretation of it and have started back into it. I had the EA81 in the yellow plane in my member pic but changed that out with a 2000 hour 912 . I had already mounted an old EA81 in this plane so it made sense to bolt the good one in. I'm trying to lighten the 81 as much as I can, lots of lightening holes, a small permanent magnet alternator, i'm thinking of 400mm of steel exhaust from the heads and then into aluminium to the muffler, any thoughts on that?