[sanddrag]

Well that's one heck of a reduction (in a fairly lightweight package too). But why the (what appears to be) 1:1 gearing on the last stage? Also, you should render that thing in Inventor Studio if you have it. It will look nice.

Also, nice job filleting all your corners. However, your machinist won't be thrilled with that really pointy triangle. What do you need to get in there, like an 1/8" or 3/16" tool?