Creating Collision Hull mesh for my model

[Anonymous]

I need help creating a collision hull mesh for my model below.  I've made box shapes and convex shapes for the collision mesh, but I don't know how to use MassFX to create a collision mesh for this model so that I can delete the original shapes that I've created for the hull.  

[rendermaster]

if im not mistaken, mass fx have properties that generate collision hull mesh for the model