Welcome to the forum.
I started this hobby with the brushless savage as well.
What savage have you got? is it the older style diffs or has it got the 'easy access' savage X diffs?
are you using plastic or the HPI aluminum differential cups?
there are many variations to convert yours to BL.
here, go through this website, there are quite a few savages on it, perhaps you'll get some inspiration from it (if needed)
http://picasaweb.google.nl/buikpijn
the thing is that the new FLM electric kit makes converting a savage simple and easy. no need to fabric your own parts.
http://www.rc-monster.com/forum/showthread.php?t=5115
Here, please read this thread, it might be interesting.
Are you planning on going lipo or NIMH?