I like the tubular tap setup...looks very clean. I have built several keezers over the years and through my own trial and error and reading, I have learned that if you are going to leave a gap between the freezer wall and your paneling...you need to use fans of some sort. The best solution I have found is to adhere the panels directly to the freezer and make a cutout (or drill multiple holes) over the vent (usually on the side of the freezer) and cover with a decorative vent cover.
...as long as the side panels are warm to the touch, that means that it is displacing heat efficiently
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