So wasn't able to post these as soon as I wanted to but luckily Mithion helped me out a bit to get these to you.
So this is the setup, pretty basic with just a seer stone above the door
When you get close enough the door will sense your presence. The eye will open and it will emit a red stone signal
Just a quick shot of the nexus powering the contraption. This is the light nexus which will create constant small amount of power (but its still more then enough to run at least a couple doors like this)
This is a shot of the interface showing the two foci needed. the gold one on the left is the lesser focus which determines the range it will spot you and the black one on the right tells it to look for players
This door will open for any player. If you want to key it specifically to you and/or a small subset of people then you would give the seer stone a keystone with a combination of runes inserted into (think the key to a lock) and then shift right click on the seer stone to invert the detection mode (normal mode detects all players except those holding the specified key stone). So long as you have the keystone anywhere in your inventory the door will open for you, and voila you have an automatic door.