Good questions!
You should be able to slide the fridge to the right and remove or relace it in needed, however, since most fridge manufacturer’s change models every year or so, the dimensions could change. The hope is that your fridge will last for at least 5 to 10 years. You would need to cut it free from any spray foam insulation, which could be a real pain.
If you are concerned, just assemble the keg box so it can be maintenanced by removing the front trim & panels. In other words, don’t use glue. In places where you need to fill spaces with spary foam unsulation, use some plastic sheeting to protect the wood and keep it from sticking.
I always suggest placing the CO2 tank OUTSIDE of the keg box. The regulator will need some tweaking to get the right pressure and the last thing your want to do is keep opening the keg box door.
One last thought:
If you are building the bar next to a wall, with an adjacent utility room, you can modify the design to place the fridge in the back room. Cut a hole in the wall to allow the front of the fridge to enter into the side of the bar.
I did this with my keg box and it works like a champ!
I will add some photos in the Builders Gallery of how I did this. I also plan to document this in a new “Keg Box End Cap” design that is very similar to my home keg box prototype that was built to test the design in my bar.