So now we have 1 home made bike and at least 2 HPN custom fabbed frames. Those 2 in the first 2 post links are different bikes and they are privately owned since they have different license plate numbers on them.
Somebody has to make them.
You can buy a custom hand crafted Norton Slimline or wideline Featherbed frame in nickel plate with almost any mounts for various engines already in it for under $2000.00 USD so I am sure someone could make a trellis frame for an oilhead for that or less.
I am considering buying a YZ....or whatever frame and using that as a jig for geometry and building off of that....big project there though.
it is easier to ask for forgiveness than permission