I have seen it before but I don't know the full spec list... I know for sure that the crankshaft is ballanced,new connecting rods,new pistons with higher CR ,camshaft, head porting and custom mapping with ECU. Only thing that I know is that it was having 250bhp at 12000rpm...
I will take a look at the kawasaki engine but the engine internals and gearbox will last? It is a kit car project and from what I read the hayabusa engine is very popular due the torque that it has and reliability I guess...