They are two different airframes....
Dragonfire said:
"Kind of along the lines of converting a CH-53D into a CH-53E..."..... probably more along the lines of converting a
CH-3E to a
CH-53E; two completely different animals.
The fuselage chord/dimensions are different, the pylons are different, the cockpits are different, the transparencies are different, the gear configuarations are different, the rotor heads/blades are different, etc etc
Probably be easier to make a wood/clay mock-up of the "46" and vacuform it.
Take care,
Frank