Airflow: The cabinet is about 19" deep, approximately the rear 5" has vents on the top and bottom.
Over current protection: Yes multiple, each module has built in current protection, plus there is a fuse on each rail.
Over voltage protection: yes multiple, each module has built in overvoltage protection, plus there are added scr crowbars.
Local regulation, adjustable via front panel pot with front panel meters, the system can be calibrated in less than 10 min.
No modifications need to be performed to anything and you no longer need to use a power sucking change over unit.