I really don't see how using his driveline design (leaving aside S&S vs. Harley engine) would cost much, if any, more than the way they did it.
Doesn't his design involve a propshaft tunnel running diagonally through the seats? Looks like the passenger seat is only accessible to those with the tiniest of backsides.
![[Linked Image]](https://tm-img.com/images/2021/10/04/morgan-trikes-ace-cycle-car-three-wheeler-vintage-5.md.jpg)