As for the alternate load bearing structure of the Apache rotor system, bear in mind that it may not be feasable from a design point of view if you want to carry passengers to do it like that on the modern civil helicopter although it would make my job a lot easier for swapping out an MGB if it were.
If it can be done on a small civil machine (MD 902) why can't it be feasible, from a design point of view, for a larger helicopter?