VersaChassis CAD

[peter2587z]

Here is my first CAD attempt.

SPECS:
31x24" Long chassis
8 x 4" Wheels
3 Cim WCP shifter
HTD 5mm 9mm wide belts
30T pulleys
Distance between center wheels: 9.8435" (130T belt)
Distance between outer wheels: 7.2844" (104T belt)
calculated with https://store-b98ca.mybigcommerce.com/how-to-belts/

Questions:
How much does belt stretch? If I round those center to center distances to an easily measurable number will the belts fit? (9+13/16" and 7.25")

If I use the center to center distances do I still need to use the WCP cams to tension the belts?

TODO:
Bumper mounts.
Make additional holes for Ball shifter
Cut down T brackets.
Belly pan.
Battery holder.
Choose wheels.
Add all hardware and spacers to wheel assemblies.

Thanks,
Peter