bobby hall handcycle compared to morph 2 and proposed morph out

I would like to establish the desired dimensions for the next version of the Morph hand-cycle, called "Morph Out". It seems like the dimensions embodied in Morph 2 work better than the dimensions of Morph 3, particularly in regard to ease of turning and "float". Morph 3 is superior in that the low position is lower than m2, and the frame is significantly lighter.
As a goal for Morph Out in the low position, it should match the geometry of the Bobby hall hand-cycle. In the high position it should be as high as Morph 2 high position.
What follows is a pdf comparison of these different layouts, and proposed layouts for Morph Out. Please comment.