Michael,
thank you for posting this. It makes me wanna dig mine out and start working on it. I lived in Germany in the mid-80s for a couple years and I saw a couple of Koenig 928 S4s on the streets. One actually Buzz passed us on the autobahn doing about 150 mph. The Porsche was doing 150, we were putting along at 85!
Also back in 1998 when I was visiting my sister just outside of Charleston South Carolina I was sitting in my 85 Olds at a light when a TwinTurbo Koenig Testarossa pulled up next to me. I gave the guy the thumbs up so when the light went green he jumped on it for my benefit and took off! So I will always have a soft spot for Koenigs. Your build is amazing. -Mark