Yes I've been through the whole MMM and made it a real TTW mod. But you will still experience more CTDs then in FO3 and sometimes some that aren't cleared up with a save and reload.
It has to do how the additional and normal encounters are scripted. NV uses a cleaned up version of the engine. While FO3 often keeps references in memory even if the cell is unloaded is NV very strict here (how it should be btw.). That's the reason why MMM CTDs more often and unrecoverable in TTW. It also means to go through all the scripts in MMM and looking for such problems which often results also in a complete rewrite of the particular script or system.
So be careful and don't rely on your saves yet. It isn't working fully even if it is cleaned up. I haven't released my port yet because I want it perfectly functioning before I do it.
