I got side-tracked form the engine to work on the front radiator since it is different from the Bz.III. I have started scratch-building the radiator to hopefully use to make some 3D printed parts.
The Benz Bz.IIIa radiator:
The Bz.III radiator
My start on the radiator:
I just need to cut the existing radiator off the front cowling part and attach the new one. Unfortunately, I may need to drink copious amounts of bourbon to get the nerve to cut it...