I thought I'd drop a little EVA-Barrier pr0n in here since I got off my @$$ and did something this past weekend:
Here's a shot of my primary + triple secondary. I was happy to see I could get three of these lines into the hole in the back that previously only allowed one line. Also notice the highly custom 3-D printed bracket for the regulator. Hopefully it holds up to the summer heat in the garage.
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And here is the box showing my cold-air blower tube + my highly customized return air ducting. The taps would have been easier if they were longer, but I was able to pull it off.
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Here you can see the three CO2 lines coming in the left side through that tiny hole. A few temp sensors because .. duh, beer geek! Then of course the tower air blower + a good recirc fan to keep stagnation down. I was going to retouch my pic to hide the mess at the bottom - but you have all seen the bottom of kegerators before.
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I did notice after that I forgot to insert the backflow preventers, but that's just a "snip and slide" affair.