Is that a new casting with relocated ports?This might be a simpler way to verify the concept?
Or is it a lot of plugs, add-on material, and welding?
It would be interesting to see how things were located around the pushrod tubes and rocker geometry.
That is more interesting than the water jacket.
NB: There is a 2276 VW on the nose of my Sonerai 2 project, but i am not actually conversant with VW engine architecture. I was more into Brit sports cars & motorcycles (wrenching & machining), and then ended up in pick-up trucks as my career veered into millwork and construction early on.