That's... rather interesting. I'm sure the story is too. Well made, but why not just source a 3C set, as there's already the manifold? Pertinax? Is that phenolic?
On a related (?) note, have you ever seen the 3B carb set up for a zwei-tack SAAB? Caught my attention at one point, as I probably went through a dozen strokers. Used to have a picture somewhere.