I can't vouch for how accurate the flight model is, but in every other respect, the SkySpirit2010 764 is the way to go. There's an FSX-native model available, so you can merge a VC
from an existing aircraft, though I'm not aware of any free 767s that come with one (I just went without and used a 777 2D
panel instead). However you decide to go about that, make sure you install the utility panel included with the base pack- I'm not sure how into animations and stuff you are, but that allows you to control all the included things like doors and service vehicles. Let me know if you need any other assistance!