Yeah, I considered that, but the problem is access - if you look at the top picture, you'll see that there isn't a lot of room to the sides of the freezer. The CO2 is on the back right wall, and if I screwed it in, changing the tank would be a PITA. So, I went with the pipe straps. I don't like how it looks right now either, though, so I may make a frame out of 2x4s or something and create a more secure holding place.
Edit: there's actually two pipe straps - one looped around the tank, and the one you see running between the studs.
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