I've been looking in on his plans for years, hoping he'd base something on anything other than VW parts. Up here they're not so common as in the rust free south and west. So then when he's got some new designs they're based on Subaru parts, gah! Subaru's are also kind of rare around here, the nearest dealerships are a 2 hour drive away and there's none to pick over in the yards. Even the Subarus I see around are usually no more than 5 years old or so, so don't know if they even sold the older models anywhere round here.
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
The XR-3 is based on a more generic mix of parts starting with a VW transaxle and Kubota diesel.
Frankly, I think there is so much diversity in the options for his design that it boggles the mind. Just look at the basic structure of it: A front suspension subframe and motor mounting that bolts up to steel box frame backbone. It is about as simple as it gets. Everything else can be mixed and matched to suit your needs or parts availability.