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As I unpacked, I let the wing start carrying some load!  The second picture is the throttle.

      The first picture is the crankcase.  It is a modified case that has had some pieces machined off, a few holes opened up and a strengthening piece added to the rear. It is pretty much a standard VW engine case otherwise.

      The second picture is a matched set of cylinder and piston.  Four of these attach to the case, two on each side. These are bored out cylinders with pistons to match.