Took some advice from a fellow board member and became my own boss...in my shop. So, about an hour ago I started designing an air powered, 60 degree, V-twin. Here is the block...
Looks good start so far. Depending on the valve set up you're going with, maybe check out David Kerzel's V-Twin using push pins on the pistons with ball valves for some tips. That's what I originally planed for my radial 8 cyl, until I realized it wouldnt work upside down.