Was not built by Jesse James. Kneeslider is the E-zine that featured these pics.
On there they have pics of another one that's unfinished that has a similar motor, but in a sideways layout rather than face-foreward as it mounts in a plane. Weird stuff.
Phenomenal waste of resources to create something mostly unrideable, but cool too..
Since aircraft radials are highly dependant on fast moving airflow for cooling, I can't see either design being capable of being ridden around town, especially the one above, the rear cylinders would probably melt down pretty quick.