I Like the Rob English bottom bracket idea. I am thinking we could adopt that. Just don't have an idea yet how the bottom bracket shell swivels.

SW, it would be great if you can add some dimensions to that sketch. Then we can pin geometry down. I was thinking because the Ti Swift works so well, we could use its geometry to design up a M60-like frame. (This morning on the way to work, I took off my longsleeve jersey, opened the backpack hanging off the saddle, put the jersey in and closed the backpack, all while riding no-hands on the bike path.)