IMHO, there's a lot of cock talked about "aircraft quality", especially when it comes to GA and LAA /experimentals.
Often it comes down purely to the traceability (paper-trail)
Those "automotive quality" drive-belts (flat, multi-vee) are extremely durable,"fit and forget" items.
The longer, "serpentine" ones follow a convoluted path,sometimes with more than a 180* wrap round pulleys of~8-10cm diameter, driving water-pump, aircon-pump, power-steering pump,alternator and cooling-fan....all fluctuating loads at fluctuating speeds in an engine going ~900rpm to~ 7000 rpm. life-expectancy is often 100,000 miles +without failure or maintenance.
that tail -drive with balanced-loading on both sides of the boom (limited float needed to even-out inequalities between pairs) seems a simple, elegant,low-stress,low-maintenance tail-drive solution,
Model Helis using a similar toothed-belt to that employed in computer printers, are extremely reliable and the Raptor series,using that drive has been the most popular mass-produced kit for a fair while.
Glad to see someone with the courage of his own convictions not letting the nanny state suffocate him.
the jobsworths would not have allowed the Wrights to fly, nor the first hang-gliders.
Aviation at this level sems to have thrived on innovation outflanking the beaurocrats with their control and legislation.
Bravo!