All of these questions are going to be answered in relation to the rotary valve e36 engine. Some answers may be slightly different on the Briggs Engines.

Funnily enough, there have been plenty of people who made their own engines reliably and usable, although rarely in the automotive world. In the motorcycle world, however, you’d be surprised how many there are! For example:

3D print it! Either in plastic and going the ‘lost PLA’ casting route or the full-on metal 3D printer version! Although for the second route, you may need the right contacts... check out this 3D metal printed jet engine:

FWIW, Keith7000's engines are built entirely off hand-drawings. He’s active on a scale model engine forum I don’t recall the name of. He also has like 60 years of machining experience...

That’s nice and all but LOOK AT THE BUBU 505!!!!

I love their new work as well.

wait until he learns that the Germans tore down a Russian-built wall

That actually is factually true. :(

This suggestion makes me want to hug my computer screen.

Think Jay Shuster’s father is (was) with General Motors Design / Styling.

Tucker? Seems a bit obvious to me. He is a great old car that was muscled out by a powerful trio of other other cars who eventually used his ideas and never gave him proper credit.

He answered that question right here:

His name is Mahk. What’s so hard to understand. Pahk the cah in the havahd yahd.

This was just this past weekend up at the Carlisle Import and Performance Nationals. I’ve been going there for decades. In recent years I’ve taken a Peugeot, but most of my time is spent with the Citroën crowd. All the Francophiles stick together.

It’s complicated and needs proper maintenance. It was never a problem in France where all mechanics are used to Citroëns, but abroad it’s another story.

I’ve posted this before, but here I am driving my box van down the Dragon a few years back. Stayed in my lane the whole way, and wasn’t nearly the slowest car on the road... I was being held up by some Harleys.