I just built a straight Kegger bar this past weekend. Did it without the Kegger and installed my mini fridge under the work space. I had to change the vertical measurments, the green highlighted one’s on the keg box frame to fit the fridge. I changed them from 27 inches to 30 inches. It cuts the area from the work space to the bottom of the bar top. 3 inches was not that much but if your measurments are right you may have to go up to 5-6 inches which would leave only about 2-3 inches between your work space and bar top. You could raise the length of your side upright but that would raise the bar higher than 42 inches