Steveo, I didn't convert specifically an Inferno ST, but instead a Kyosho MP 7.5-based Inferno. I'm sure it would be a similar conversion. My biggest problem was finding a safe, balanced location for the battery; everything else was pretty straightforward!
i know what your talkin about, its the first thing i was lookin at, i dont know what your runnin for batteries but for now i have 12 cells not much room for that thing even for a 4s lipo pack, what motor esc and batts are you using, oh how about the motor mount