The only thing I would imagine would be a problem is what crankshafts are available, I would imagine a 2" rod journal would have to be a minimum. Is something like that available without having one made? The blocks are plenty sturdy, piston and rods are easily changed, so I don't see what the fuss is about. The only other thing would be camshaft cores with a wide enough lobe separation. I don't know why no one else has tried an engine like this already