Derek,

You lucky bugger. I can do a lot with my Taig but I sure wish I had access to some REAL equipment.

Do the twin, but make it with two .09 cylinders, might be easier. Or, if you want a REAL challenge, try two .010s.

Just kidding. If I were to try the twin, I'd do it with .049 cylinders but I'd be tempted to use Norvel or Wasp parts.

But, Andrew Coholic is THE man. And a right decent fellow to boot. Excellent flyer and experienced in a great many aspects of the hobby.