Ah, sorry for assuming you were blind By "configuration" I thought you just meant that freezer model.
If I were you, I'd make a 5 minute scale drawing in Powerpoint or Word, this is very easy to do. Make a box that has the scaled dimensions of the floor, then 3 circles that have the scaled diameter of pin locks, then 1 circle that has the scaled diameter of a 10# CO2 tank. Drag them around and see if they can fit. All the dimensions are in that post.
FWIW, building a collar is very easy and a lot of fun.