That is a very sweet looking frame!
The linkages look like they would be pretty progressive too.
My only comment/question is when does the swing arm actually pivot, can't quite see in the pics.
Most of the bikes I've owned pivot jost behind teh BB keeping chain length pretty constant.
I did ride a Sunn Dual years ago which pivoted infront of the BB and when the the suspension compressed, you could feel the pedals ease up as the chain length increased!
But, I'm guessing with today computer simulations etc, this has probably been all but eliminated.
Jacko