[January 29, 2010 From Graham Butler:]
My approach with the seat was to keep it simple. I just moved the cross member forward until it did not interact with the main frame. The simpler the design the less chance there is that we will have problems with flex and failure. I think that if bottoming out is an issue, then we should consider raising the seat rails to give more clearance, or consider a solid seat.
(Editor's note: the cross-member in the middle of the seat bottom was going to hit the main tube when you morph down. Graham moved it forward. This still gives sufficient strength, but eliminates the interference.)