Trench Box v1.0.0.0

This is a trench box, to protect workers when working in trenches.  It is a single model, that uses skinned mesh to be able to adjust the height, length, and width.  They can be attached together to form longer protection.  It can also be lifted by any of the cranes that I have made or that Shane Phillips has made.

The cross bars have collisions, so excavators should also be able to drag them or lift them from those points.