Well, after testing the Arm Cannon, it seems to take the MP5's script. It doesn't use the smexy grenade in the picture, but the tiny-ish MP5's one.
I fixing it and making it better tommorrow, which is my 13th B-day! :D:D:D:D:D::D:D:D:D
Im not going to be on for long tommorrow though.
In the movie I think he only uses swords.
Exactly. This is only Live action stuff. With the exception of G1 Megatron pistol being an easter egg.
What do I model next?
Why don't you try the swords. Go to General Modification Help, and go to "How do I color and animate in ms3d?" By Niven, and you'll see a picture of the sword. Remember to not make it stand up. Make it how he uses it.