Hi Tony,
A few years ago, I started to build a 9 cylinder 2 stroke radial that was based on Cox .049 cylinders, pistons and rods. I got as far as the crankcase and front housing, but never got much further.
It was going to use a common crankcase and crankshaft (like a 'big' 4 stroke radial) and a vane type supercharger to pressurise the crankcase. This idea was based on the Berger 2 stroke radial that was available at the time. I doubt I will ever finish that project, and now when I look back, I was probably a bit optomistic...Cox .049's were often a pain to start when there was only 1 cylinder
Warren