The rear triangle is my first part to assemble.
To finish the tube joining the rear dropout I tried to make the ends into bullet shape.
I cut a small piece of 1/2" tube, cut some notches into one end and hammered the end into a bullet shape.
The 1/2" tube fits inside the 5/8" tube giving me a thicker tube to weld the dropouts to. After some welding and grinding I got some sort of bullet shape.
I also cut out on the inside of the tube so the dropout plate can be welded flush with the inside of the tube.
So this is the finished bottom half.
I found may first mistake, the U bends is 135mm on the inside, the same measurement as the rear hub.
But the rear hubs is about 5mm off centre on the drive side, so I get a 5mm larger gap on the drive side between frame and tire.
I should have made the u bend 130mm and bend the tube outwards on the drive side.
I don't think anybody will notice when the chain is fitted, but I will.
I decided to make the rear dropouts horizontal. The Shimano gear hub has a washer on each side which decide where the gear shift cable will enter the gear hub.
If you look at the rear side of the hub in the picture above, there is a black tube sticking straight up with a circle on top, thats where the gear shift cable goes.
I rather have it follow the frame.
The washer looks like this.
So I'm tempted to make one where the hole and the key are in the correct position so the cable entry will be parallel with the frame.