Just as a minor side point, MTOW is not necessarily a structural limit.
For instance, the GAF N24A MTOW was OEI climb limited and, I am sure, there will be others - the updated MTOW exercise quite some years ago for the Shrike, likewise, was OEI limited.
Caveat, it was quite a while ago that I was last involved with N24 flight tests so I am presuming that things haven't changed for the model.