Ben,
I have no idea why I had used 15". I think it looked too short of a distance at 10" 
I find my lista nd write up a conversion chart this weekend if I get the chance. I will also give suggestion for basing, single models ect.
I think I also have a set of MA skirmish conversions as well for the 28mm. We played along time ago, so I need to find my notes.
RebelMike