My first production was the basic monoeyed humanoid frame. The Heavy Weapons Model is actually where you can see the original idea. Heavy was quite the word for it; the legs and arms were much too heavy. The legs, in fact, were too bulky as well. I scaled it down to the eventual Footsoldier Model, but I didn't leave the original model, obviously.
No, that became what you can see as the Heavy Weapons Model, with only minor modifications to the interior mechanics. As I had stated, the model was too heavy, but that was perfect for carrying any weaponry of that sort. The legs were kept bulky and wide to support the weaponry and provide stability for kickback (weapon firing). The arms were streamlined, but kept armored and tough to likewise help with the kick of heavy weapons. They are much different from the Footsoldier's (FSM's) arms and are mostly for handling shell-firing weaponry such as the bazooka it holds in the photo.
Now, one might ask why the main body is unarmored. It is partially because of aesthetics: I liked the original white body and I felt that the army should be uniform. I did not keep to that, as you can tell. Regardless, I kept the HW model as it is by remodeling the insides rather than the outside. Technically it's a bit more expensive that it should be, but if a man must leave his mark, then I will leave it by keeping the HW model as it is...perhaps as a sort of monument to the type that started it all. Of course, future models based off the HWM will be reformated a bit, but the original will be a mark in my history.