I found some specs
Upper bars angled 35*-45*.
Upper bars = 70%-80% length of lower
Lower bar no less than 14". (20"-24")
@ ride height, lower bars angle up 1/2* and upper bars angle down 6*

So, questions:
I seem to recall input shaft angles down 4*?
Locating arms on rear end: should upper bars stagger relative to location of lower bars? Seems to me that mechanically speaking it would be stronger if top brackets were exactly over bottom brackets.
Top bars point forward or back?