Brilliant, should have thought of this in the first place, but there are belt length calculators out there. So, I lucked in (I think) to a standard 188mm belt assuming the 70tooth is about 47mm diameter and the 20tooth is around 15mm.

Otherwise, I redid the side panel for the side with the motor. I did a cut-out for the sliding motor and mirrored the piece so you can opt to having motor on the outside on either side as per your preference.

I thought to, if I had to fiddle with the motor slot location, to make a tool to cut-out the motor from a panel. So all three elements (two mirrored sides and a motor cut-out) at Figure 1.

Figure 1
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