Placing regulators outside of the box should not be an issue. Seal each line going into the box to prevefnt loss of cooling. If your temperature can be maintained, you really should not have to adjust often. Can you catagorize the types of beers into groups of two or three in terms of carbonation levels?
If so, possible you could use less secondaries such as as
two or three pressure set up and then split with a
distributorinside the box.
Scott Zuhse, Instructor
Micro Matic Dispense Institute