Hmm. I prefer proximity so the Door is actually open by the time you get to the 'frame'.
Door restrictions are already planned.
Up / Down...probably not going to happen. I'll adjust the rotation to fall in line with the N,E,S,W though.
I'll make the Door 5 bricks tall and spawn top-down instead of bottom-up.
I'll adjust the model to have the depressed areas on both sides.
About the light corona shining through...nothing I can do about that. It's part of the game. Check out the hammer, wrench, printer, or even the jeep. They all show light coronas.
I'll look into fixing the projectile collisions.