Welcome to the forum, you can either browse the revo section, or just search "revo conversion" and you will find some good pics and info. I have done a few revos and think leaving the stock tranny in and using a rcm motor mount is the easiest way, You have to mod the chassis quite a bit to get an emaxx/erevo tranny in there, as the mounting spacing is quite different.
the only problem leaving the stock tranny in is that it strips alot! im running a 6cell 5000 lipos with a mamba monster esc and a neu 15152d 2050kv motor and all it does is strip no matter how you tune the esc.