The only question I have, Tom, is, with the engine that tall and heavy at the top, is there enough side to side support on the one tube frame members? Like if you lay it down, will the engine want to deflect sideways. I do see the nice double gusseted bracket supporting the engine case, but above that where the frame is a tube there will be some pretty good local twisting strains, maybe?.
Of course you can tell better by feel, since you have the bike and aren't just looking at a photo, like I am. Also I don't know how heavy that tube wall is or if there are doublers, etc.