Well, in schematic view I connected "Body" to "bone_abs". So the unit works in-game now, but its as stiff as a board. I had a look at Prof420's modelling video #6, and I thought I had worked out how to weight vertices. However, I have come across a new problem. I can't find the weight tool he uses to weight the vertices.

This is my 3ds Max:



And this is his:



I can't find this tool anywhere, but I'm copying his video tutorial step-by-step to get this done, and I'm kind of stuck because of this. I'm so near to getting the whole problem solved as-well.