Mike at RcMonster make the Revo motor mount. I've use it in my MBX5 1/8 buggy conversion. I've drill 4 holes in the frame, and i've tap thread in the hole of the RCM revo motor mount and fixe it on the frame of the buggy.
To be honest with you, i don't have try it yet, because here in Quebec, we have about 4 feet of snow
And more, i've remove all the brushless of my MBX5 and re-install it in my revo.
My MBX5 is for sell, because i just bought a Baja 5B SS. I'll keep the révo to play with my kid when we go on campground (he have an electric Stampede).