Now that is a beautiful build. Great mechanics. But the lozenge is laid wrong direction and no rib or edging tapes. Notably there is another minor issue.
From Mr. John McKenzie un the UK (he's one of those historian blokes).
"Unfortunately, the modeller has fallen short on his research and has wasted such a bit of time and effort to make the propeller turn in the opposite direction to the crankcase / cylinders. But with the Siemens Halske type Sh III , 11 cylinder motor, the propeller / hub, is fixed to an extension of the crankcase front cover plate, and does therefore, actually rotate at the same speed and direction as the crankcase / cylinders .
It is the crankshaft which revolves at the same speed but in the opposite direction to the the cylinders by differential gearing located in a drum type housing at the rear of the motor , and which incorporates parts of the rear motor mounting flanges .
John M ".