Topsie, or anyone else who knows.  Why is the Z Axis motor on the heavy on top and not inside the rear top housing?

I put it on top initially to keep the closed belt as short as possible.

The heavy version Z motors support also keep the front and rear to an equal distance.

In the V1 version if you tight too mich the belt, the front tend to bend a bit

But if you want or if you have a longer closed belt you can mount it like on V1, I kept the V1motor mount in my design