I love this baby, I really wouldn't change a thing! I'm not sick of opening the false-doors yet. I dont go rummaging in the keezer all the time, I generally get in there about once a month to pull empties and put in full kegs, it's not a big deal.
The only thing I found is since I put the thing on such large casters it's pretty high off the ground, I bought this little collapsible aluminum step-platform ~18" high from harbor freight, I like to stand on that when putting full kegs down in there, its a bit easier on the back. Also the only other (minor) flaw is that the kegs that sit under the middle support cannot be removed just by themselves, I have to pull at least one other keg so I can slide the keg in the middle under the support over to be able to pull it out. If I did it over I would probably use more, smaller casters than just 4 of the 8" ones I have now.
Also I've found over time just using a plastic 2.5 gallon bucket for cooling water on the hump that this system is great at maintaining ferm temps when you are at that temp, but not that great and lowering wort temp if I dont cool to pitching temp with my CFC. Thus if my wort is 5-10 degrees from target start temp when I pitch (typical in high summer when groundwater is 70F!) I just add a few blocks of ice to the chamber (just large yogurt containers filled with water) which really help to add some cooling power and quickly (over ~1-2 hours) help to cool the wort that last 5-10 degrees. I plan to build a better sized and larger cooling water reservoir from metal duct-work which would also help with heat transfer but I haven't done that yet, as the bucket works well enough and I'm constantly doing projects on my house which eats up the rest of my free time.