Who built this

[Wynand]

Originally Posted by alga

Could be a Locost with Rorty IRS.

They look like Indy front wishbones to me. And if I'm,not mistaken isn't the Indy 2 inches narrower than the Haynes? But that isn't an indy chassis LOL, who knows

Im gonna be devils advocate here

If the chassis is the same width as the original book chassis (2 inches narrower than roadster) but 4 inches longer in length than the book one, it might just be a McSorley 400 chassis. The chassis construction point towards this.
The McSorley 442 & 442E are 4 inches longer and wider and 2 inches higher (albeit differently portioned between these two chassis) than the std book.
chassis.

Wishbones is not indicative of a specific design in many cases simply because many change these items for aesthetic or geometry reasons. In my case I modified the upper WB to add more positive caster and both bottom and lower WB are of my own design. Many others does the same all the time for whatever reasons they see fit.