Update:
Shock installed with a new spring. A bit stiff but otherwise working great!

It may still get moved if need be to improve handling but hopefully not. The old 120 rear wheel is now a perfect 180 setup. The swinger is attached perfectly in-line and on-center (not an easy task at all). As much as I love my other build I dont think any of my toys make me smile as much as this one.

Also, I've updated the first post.
Next up will be learning how to make a custom wiring harness (looking at a Motogadget setup), an RSC race carb-modification, tuning for larger jets with K&N air filters and finally, a temporary muffler setup. A Fibreglass/Kevlar seatpan and upholstery come next along with a battery and electronics box.
Check out that new beef in the rear -- finally balances out that massive 300lb inline four.
New shock angle with heavier spring. We'll see how she handles. Rear brake and linkages all set up with custom brackets and mounting. I'll be making a custom heel guard soon out of CF/fibreglass.
Extra angle: