I am pushing the upper limits on ship size

When I just tried to see what the top end for the very large battleship with 21in guns was, I ended up with a Reynolds number above 5.99x10^9! I need to add some more data for Schoenherr frictional resistance coefficients. I tried increasing the power to 350,000 SHP. To actually do that requires 6 shafts, as there is the approximate limit of 70,000 SHP per shaft. Above that loading, the shaft will fail. So to increase power to 350,000 SHP requires 6 shafts with 58,333-1/3 SHP per shaft.