Rcpilet, that was quite a description of how to convert the engine ! I wont need a carb adapter, mine bolts right to the cylinder with an adapter. The case I have is a bit bigger than the one you started with. The fuel tank on my saw was inside the aluminum case. I have been looking it over and think I might be able to do a flat plate on the backside. It doesn't look like the 180 degree flip of the cylinder and crank would benifit me with the case I have. Here is a couple of links to pics of the case I have.

[link=http://home.bresnan.net/~superfast/files/engine1.jpg]Engine Case Picture 1[/link]
[link=http://home.bresnan.net/~superfast/files/engine2.jpg]Engine Case Picture 2[/link]

Scott