the cheap way to convert is the kershaw designs
Bad thing is the motor is mounted kind of high, and the batteries are mounted on the outside. If you run the stock transmission, you can use the mechanical brakes.
I dont think FLM is going to sell the "cheap" version. I think they were referring to it because it was their test in progress. Not sure though.
Here is some info on the ammo: http://www.rc-monster.com/forum/show...highlight=ammo
Also definitely use these calculators:
they will help show you what you need for what you want.
and look at these post, many have converted their savage. Seems the Fieago series is good. Like 8XL, 9XL depending on what batteries you are running
Also, dont just read this, but memorize it (Serum's Common information about setups etc.):