Impressive results, cast crank and all Its great to see someone developing the single cam VG30 in such a methodical and well illustrated way, a very under rated engine.
As far as turbos go, my VG30DET has a GT35R with a 1.06 a/r turbine. The car is still being built but the theory is that for daily driving there will be little boost available, which is fine. From experience a turbo that spools up low in the rev range is a PITA, you just don't need a lot of lower range power in daily driving, relatively.
Given the basic similarity between the VG30ET and the RB30ET, it may be of interest to know that the GT35R with a .86 a/r turbine on a RB30ET gives big big mid range performance.