I really like the look of your new swingarm assembly .... you've reinforced areas that are bound to be stressed by force generated from the retire bouncing down the road .... do you have any concern about its ability to standup to those forces over time ?
Nope, it's overbuilt.
An old saying about 3 wheelers is that you can't miss every pothole, the rear wheel will see more than it's fair share, and is overbuilt accordingly.
I have just been in 2D CAD trimming as much fat off it as I can, I tend to overbuild parts and reduce weight later rather than vice versa.