I decided to go for it. Unfortunately they are on back order so while I wait for the castings I decided to draw up a 1/3 scale wagon to fit the engine to. There is a huge amount of info on the web but not too much in the way of useful drawings. There seem to be a few variations with various reproductions and Mercedes aren't very forthcoming with info. Nevertheless this is the story so far. I wont hijack this thread any more and when I start the project proper I will start a new thread.