Yes!
An entrepreneur in the GDR had two H3Bs in his fleet that were in urgent need of renovation. Under the old chassis number, S 4000 T low frames, IFA W 50 engines, among others, were given a new body at KAFA, Leipzig.
The first bus, our puzzle bus, was completed in 1967, the second followed in 1969.
The first received an overhaul after 1990 and is now part of the fleet of the "Verein Historische Nutzfahrzeuge Hartmannsdorf e.V.", the second is lost.
Here follows another point for you.
I attach a few photors from the history of the bus.