So I see all of these cool micro sized helis with fullbody shells, but it seems that they are all coaxial helis. I relalize that some mods wold be nessicary to the tail section, but is it possible for me to mount the body off a, say, mCX2 onto a mSR X? Would the same be possible with the shell offone of the "Force" battle helis?

Why not- a little cutting and clearancing, some glue, and voilĂ*! You are just gonna have to get one and see- there are deals going on all the time for body shells- I have 4 that I set up for my cx2; a cx1 body, a cx2 body, a Bell Jetranger, and a MD520 notar - like the cx3 has... the biggest problem for me was figuring out the best way to section them so they would come off with minimal effort yet still look right.