TOWER INSULATION
The tower came with a bit of loose rubbery foam insulation and a small Styrofoam disc in the cap. I jammed as much pipe insulation foam around as I could and still clear the copper tubes. With the combination of the copper tubing and the insulation, I haven't had any problems getting a cool pour.
WHITEBOARD DOOR
This idea was taken from someone else who did something similar. I couldn't get both my kegs in and still close the door on the newer model of fridge, so I had to hack off all the plastic innards and remove a lot of foam from the door. I cut a melamine board down to size, filled the inside cavity of the door with Great Stuff and clamped the melamine down. Then, I caulked around the whiteboard. Haven't actually used it yet for writing beer notes, but at least it hides the door innards.
SOUND PROOFING
Not sure if I got a lemon, but the compressor is SUPER LOUD and quite annoying for both me and SWMBO. So, I purchased some soundproofing foam and built a bit of a "box" at the back of the fridge and also stuck some strips underneath the fridge. I fear this will be likely shorten the life of the unit, but it wasn't tolerable otherwise.
Cheers again to everyone who has contributed to this excellent mod!