Oh interesting. I guess it didn't click that the chain cable has you re-route the cable down to the board directly instead of running up then along the upper right edge, then down the side edge, then down. Makes sense looking at it all of course.

Can you take a picture of how it attaches to your case on the end opposite the endstop and motor? From Thingiverse it looks like you have to drill and screw a few inches up the side. But on yours, I can't tell how it ends.