um...i have not tried to mess with weapon mods...
the C4 models work because it was easy for me to set up...all i really did was extract the files and place them in my BHD folder. The model files names happen to correspond to those in the C4-BHD MED's items.def
i guess it would be quite easy to add weapons as all i need is the weapon's .3di file and its textures e.g. .dd
then i have to do then is name them the same names as those in demores.pff
i can try this if anyone could tell me any .3di editors and .dd editors...
btw, does my models work on your BHD?