I have a low tolerance, for PITA. And mine is a PITA with 4 kegs, and I'm a sloooooow drinker.
To avoid the extra lift, I put a swinging door on my collar. Taps are to the left and door is to the right.
you can just make it out in this pic.
Edit: OBTW, you've done an awesome build....I need to make a lower collar with wheels like you did.