Sure thing.I've just noticed the offset spokes in the rim. You probably mentioned this many moons ago when you built them but could you explain the choice please.
The original bicycle tire look was to narrow for this project.
So I did some research about an 'old school' styling of wide rims and how wide could the tires go and still work.
The end result was I could go twice the rim width and the tires would still hold with no safety issues. Yet they would look wider/fatter. Which they do.
It takes two tubes to get the right amount of air pressure and sidewall strength.
I used two more identical rims and secured one to each of the old rims, using pop rivets, some screws, and plenty of JB Weld. They ain't coming apart.
I filled in the gap between the two rims with body filler and sanded until I had the look of one rim.
It was a lot of work with this method. Next time I would use steel rims so they can be welded together.
To center the hub/spokes created a spoking tension/angle situation that I found wasn't to my liking. So I went 'old school' and left the spokes/hub off-center, in their original holes. Because the vehicle is more for show and 'slow' go, the off-set won't be a problem.