I can fit 8 kegs without the collar but it also makes my bar top a bit too short for my liking. With the collar and caster wheels, I have my top estimated to be at about 4' tall right now. If I remove the collar, that pulls it down to less than 3.5'. The collar is more about getting the bar to the right height than about having more storage space but that is an added benefit.
Turning the freezer around has no bearing on the way it opens. I'm ditching the lid for sure. It's so crappy that I don't want it in the build. I will still put the hinges on the back of the bar so it lifts from the front. They will be connected to the collar and new lid, not the freezer, so it won't require me to mod the freezer in any way other than to remove the lid.
Here's where I'm at right now:
Plans for base on casters
Plans for bar top and coffin
Pics of freezer and base as it sits now with one shot of banged up lid