I thought I would post my keezer build since I went with a tower instead of a collar, which, from what I can tell, is in the minority on HBT. After much debate I decided to go with the tower, mainly because I love the look of the tower and space isn't an issue so I can open up my lid without hitting the wall with my tap handles.
Here's my CL freezer (already with the lid taken apart), a kenmore that will hold 6 kegs, a 20# tank and still have room for bottled beer and pint glasses.
I needed to reinforce the lid with some 1/2" wood in order for it to be sturdy enough to mount the tower onto.
I used gorilla glue to attach the wood and let it cure overnight. (The wife loved me using her mixer to hold the wood down!)
I used leftover wood to attach 3- 5"X8" pieces to where the towers will be mounted for a little extra support.