'Question...are you going to do anything with the shocks to reflect your newly created geometry? To prevent undue sideload stress on your shock shafts and seals that could lead to premature failure you should measure and duplicate the original shock angle by either moving the top shock mount location rearward on the frame or the bottom shock mount location on the swingarm forward.
I've seen the extended swingarms on the metrics/crotch rockets but often wondered what kind of advantage there was if any. What's your reasoning for doing so? Post up more pics as you progress!