This is a little old, but there are several conversion threads on this forum for the CRT.
I went a little odd compared to most people.
I went for a saddle configuration, and I'm using a Castle 1717 motor. Before my twin 3S batteries got old, it was an insane monster. I love wheeling the truck around. But the batteries just can't handle the amp draw anymore, they are about 3 years old now.
http://www.rc-monster.com/forum/showthread.php?t=30843
Looks like all my picture links are dead in that thread and I don't want to go through it again.
Heres' the flickr set:
http://www.flickr.com/photos/8554026...7631192973980/