if that kind of depth and spacing is practical
The way normal VW heads are cast, for high volume, and with
my abilities at sand casting - it isn't. Back when Hoover was still alive, and Saturn had just introduced lost foam casting, I was thinking lost foam would work. It could but the tooling to make the foam cores would be expensive and there is no real advantage over plain multi century old technology - lost wax.
Using 3D printing one can even use, for lack of a better term, 'lost print'. But that is still so time consuming it's probably only practical for very intricate one of a kind projects.
Also, that head shown is full of ideas that just aren't practical or even needed. It weighs too much and the combustion chamber shape is little more than 'monkey see monkey do' guess at good squish and fast burn. Lots of work left to do..........