The AvantSlot Audi will give the low CofG and is light in weight but as you say clearance could be a problem. You could try a Slot.it Flat6 motor or one of the more powerful slimline motors from Scaleauto (not seen one use in an AW config tho') to fit.
An alternative bodyshell would be any of Slot.it's GroupC range, but use a lightweight interior.
Looking forward to seeing how this progresses.
Cheers
An alternative bodyshell would be any of Slot.it's GroupC range, but use a lightweight interior.
Looking forward to seeing how this progresses.
Cheers