Who do you mean by experts? people on here or A-series engine specialists?
Think about the 16v KAD head, been around for ever, fully proven, make well over 100bhp per litre and will cost far less than this and a DIY build.
Not talking about this project but there is somebody else on the net doing similar, making his own cranks on a fancy multi axis CNC, I turn up at a crank specialist the other day and there they all are, all scrap because they didn't know what they were doing and needed saving somehow. ..and the cost was more than a brand new Arrow crank. These new experts need to walk before they try running.
Love all the posts on oil fed thrusts, any A-series block can be converted with nothing more than a hand drill and 1mm drill bit.