I've saved my custom model as an OBJ and used Glitchys MES to convert the OBJ and BLP file into an M2.
I've put together the MPQ.
This is what it looks like and it does not work. The item I want it to replace it 'Crochet Hat'. The MPQ removes the 'Crochet Hat' from my character but the new helmet is not there.
I do have a leftover .MTL file from when I made the .OBJ file using 3DS.
Does anyone have any ideas?