Cool, AC3D - I use it as well. Now I think a great tool for you to use wıth AC3D is under Vertex - Snap together. The way this works:
-Select two or more vertexes by holding down shift and clicking
-Selecting Vertex > Snap Together
-Edit a bit so it looks right
What this does is snaps vertexes together to make separate objects flow into each other a lot better, and I think that's exactly what you need for this model. As CoffeeG said up ^^there^^ you need to pay close attention to the dynamics of a model

Good luck with finishing it!
-PwP-
EDIT:
Your signature is
the most original I've seen