This is a sweet setup. Thanks for posting. I only have a one faucet freezer right now, but it works. I really like the wood finish. I think I will take mine apart and do this after I drain the current keg.
It's a little work, but I love the wooden collar. You also then have the option to easily punch holes in it wherever you need.
What size freezer is it? Can you fit 4 cornys?
If you're asking about cubic feet, I'm not sure. I'm happy to take some measurements of the inside if you would like to know. Unfortunately I can't get another keg in it. If you look at the right hand side under the regulator, it has the little shelf in the back. And a keg is too tall to fit there. And the area in front of that shelf is too narrow. So that's where I put the CO2 tank.
If I had a really short or narrow keg, I might get it in, but I think this keezer will just stay as it is. I have a little mini fridge that I got from a neighbor who moved away, and I think I want to use that to build a nitro tap system. Not sure yet, possibly a project for next year.