There are a couple build threads regarding the Hog Bipe. Do a search and should be able to find them.
I've got the kit already. It's on my list of planes to build this winter.
From what I've gathered the three biggest mods are; dual aileron servos, Move the landing 1/2" forward, and using a sullivan tail wheel instead of the one included in the kit.
Oh... And RCKen will tell you that you absolutely MUST use a 4stroke motor in it....