Allright.. so we are back at it.
Regarding the brakes..
As said earlier a new center for the disc is necessary. This will be done near the end of the build. I also want a new rim for the beltdrive.. the outer one, to center the bolts better.

This will be done together, and perhaps more things like these will pop up the coming time so then it can all be ordered at once.

Also had a long talk with the builder about the bracket for the front caliper. He is a well known builder here in the Netherlands, and has many published builds in magazines but he usually works on Harleys. He has been doing it for 25+ years. The last bike was a build from the ground up starting with nothing, of which he has done many.
He is adament that it will work and is strong enough, and the weld is proper. So I will trust him. I have known him for many years and so far anything he has fabricated has never failed. Nor have I seen any of his custom builds fail.
The bike will not be ridden that often, and we'll make sure to check it regularly.