Speaking of Eindeckers...
This is a stock Revell E.III that I had some fun with. One of the wheels had come off, and the propeller was broken. I refitted the wheel, and stole the prop from one of my spares kits.
The model is in Austrian markings.
One of the many things people have produced over the years is a variety of metal props, engines and guns for WW1 and WW2 aircraft. One of the packages I bought was a pair of Austrian Schwarzlose guns. That and a photograph I had in a book prompted me to build it this way. Here is a link to an article on the Schwarzlose
http://en.wikipedia.org/wiki/Schwarzlose_MG_M.07/12 and here is a close-up of the gun on the model.