Hi, just some info that may be of interest. I read that the Sach Roadster 800 and 650 frames were designed by EGLI (known for their famous racing Egli-Vincent, and are kind of a Swiss Bimota).
Anyway, I thought it incredible that such a prestigious frame designer's name was not mentioned more.
So I contacted EGLI to confirm and yes, the Workshop & Technical Director Jürg Lindenmann still remembers the Sachs Roadster.
EGLI also confirmed they designed and built only one prototype. I then read MT Srl in Italy (https://mt-italy.com/steel-frame.html ) manufactured the frame, which I guess are copies from EGLI's sound design. MT Srl make frames for Ducati, Aprilia, Moto Guzzi, Husqvarna and others in Europe
Side note, the Sachs Roadster 800 prototype pictures do appear to have been clay modelled by TargetDesign on a VX800 engine/frame before eventually using the VS800GL engine in production. I read the switch from VX800 to VS800 was simple because the VX800 ceased production
Here's their website if interested
Personally, I'm going to attach the EGLI pin badge on my frame