I also have them same freezer, mine holds four also. My design is without a collar but with a four faucet "coffin" style.
Do you have a side picture of your setup?
Your keezer and Jester369's keezer are my inspiration for my project but I'll still trying to wrap my head around how the coffin should be set up so that it doesn't bang against the wall when you open up the keezer? Is yours offset from the back just a bit? Or do you have to move the whole keezer to open it up?
Thanks.