Today's goal was to get the belt path situated and basically flesh out the full xy gantry design. Using Fusion 360 I assembled all the parts I designed so I can visualize the motion. I designed a movable motor mount so that the same design  can be used for both the top rail and the bottom rail. The benefit of core xy is that as long as the motion system is fully constrained the belt path can be a little wonky and it'll still work really well.