Thank you Guy, Michael and Bud!
I have this one in my stash and it's been calling out to me for a few years now. You just bumped it up in the queue.
Then the build report was already successful

I don't know, if SPIN models is still in business today? The latest release was 2016 according to scalemates.
Let's continue:
EngineThe drawing has a note "Oberursel U.0", but that is definitely not a U.0:

Source: wikimedia.org
Luckily I had the matching Small Stuff engine in my stash and have done it. During the build:

The finished engine. The ignition wires are added too. I really like the copper intake pipes (Alclad).

I turned again a new alu cowling. After that I milled a cooling slot for the undersurface.

The resin part is more thick.

Also the Axial airscrew is done in a raw shape.

All new parts for the front together with their kit counterparts.

The new parts working together.

The airscrew still need a bit of work, but there is a chance to reach the look of the original.
Note: here you see also the second prototype with a more powerful engine, different cowling and installed weaponry.

Cheers,
Frank