I am very new to Empire: Total War (just a month), and found this forum just recently. I loved the Imperial Destroyer mod to death, especially the unit models! But I really hated the musket model due to how ugly it looks. So I did search some bayonet/musket mods all and beyond, with disappointment taking in. I did some experiment with the Imperial Splendour's musket model (because it looked sexy) to integrate it to ID, but multiple times, I've failed and ended with the mod crashing (imagine installing Empire and ID 9 times within a day? Painful)
I did one final experiment today, and it worked.
I could teach you guys how to do it, if you want to?