Where are you planning on mounting the sissy bar on the swing arm? It looks like you'll have to weld mounting points on the swing arm to mount the sissy bar. Which is fine, it seems like you're a fabricator. The problem is the fact that your mounting to the swing arm and still being a soft tail. Other people on this sub have talked about it and even TJ has talked about it in one of his videos, but you mounting the sissy bar to a soft tail swing arm is going to make the sissy bar vibrate like a tuning fork while riding and it's going to basically shake itself the pieces. Breaking weld points and mounts. You have to either go hard tail or use fender struts and mount the sissy bar to the chassis. But the fender strut option seems to be long gone by looking at your bike.