@gary55 what the hell man, making me blush over here haha! It's a nice sprocket stack but jeesh, too much!
I have to say, we all made the Night Fur(r)y. All the forum members and the love of bikes we all share is the reason for every bit of everything I have ever achieved in this hobby! I would not have been able to build any motorised bike at all without the help of everyone in our forum community who selflessly contributed their skills and experience to the forum, writing posts and helping each other out over the last ten years!
@lukecanna can you explain more please, help me understand what exactly is the problem with your QR and frame? Your hub looks pretty identical to mine from the picture.
I am not suggesting that you need a sprocket stack, only that, by some means, the sprocket needs to be well inboard of where the rotor would be/ where the outer adapter plate (spider) is on my hub.
I am expecting you will find that the chain runs very smoothly and is easy to control if the sprocket is close to the spokes, at least half an inch but probably 17.5mm inboard (right) of where it is now, about where my second largest sprocket is. That's similar to where the rag joint doughnut from the kit would have positioned it.
Edit, I forgot the sprocket is dished, and I don't recall exactly what the dish is, so I'm guessing that the magic number would be like 16mm or 17mm if you flip the sprocket over. You must measure everything to be sure of the best offset for your bike.
There are always many times we have to backtrack when building something novel but we must not be discouraged. New ideas aren't that straightforward but everything is possible with a little help from the forum community.
I am sure that any issues can be solved. We can build anything!