Hey Patel, 1st thanx for working on this laptop for mountain lion. Just ran across this now as i wish to install moutain on this bad boy. The E6410 I feel is a great machine to run OS X on outside the minor change or changes...(wifi, video..not for me though i have NVM3100 ). Don't got a webcam though ..funny how Dell makes these models in so many revisions. Anyway, I'm about to try out your install for Mountain Lion on the E6410 right now and I will post back and let you know my results.
From what I've read thus far though, great guide.
(just gotta find a spare jump drive. Its one around here somewhere)