OK, this is my first attempt at a unit. There is still things that I need to add,(Track tensioner, drive sprockets, track, etc), but I think that it's far enough along to post a preview. I decided to stick with blender for the modeling. Here is a picture of my progress. There are some details that I wanted to add, but I don't have the time, patience, or skills to do so. I'm open to suggestions on how best to finish this project. Please let me know what you think.