Just got done with my build. Now i just gotta wait for some beer to be ready! This was actually a lot easier than i thought. If you can use a drill and a tape measure, you can do it.
Here are some pics. I took the top off from the back like someone else suggested. That is the hardest part of the whole deal. Just go slow and work your hand under the cover so you can ease it off without cracking the top.
After looking at others pictures, this is the area i targeted. Its nice that the top makes a grid in the foam for you, so it should look like this on every fridge:
After digging out the foam, i located the lines easily. The plastic scraper that comes with the fridge comes in handy, as does a metal spatula. After locating center, i used a 1" hole saw to cut 3 holes that connected to let my lines through, and i was using a serrated steak knife (cheapo) to help cut away foam. This ended up working perfect for rounding and smoothing out the cut lines between holes. The metal in the top of the inside of the fridge is really soft, so both it and the plastic cut easily.
After getting everything cut out i trimmed away foam and cut a piece of old shelving that i had to fit the slot. Again, using the grid makes cutting out the foam to size really easy, then just measure your cutout and cut your board. I did it all freehand just by guestimating, and it worked out perfect. Once i got it cut and fitted, i roughly put the top on and drilled the pilot hole to match the hole i had drilled in the top, then pulled the board out and finished cutting the hole for the tower as to not have the hole saw come through and hit the lines.
Putting the top back on is a real pain. You basically have to get the post in the door, then get the tabs in the front into the sheetmetal while tilted up, the pull towards the back while pushing down. I forgot to dremel out the gridwork where my board was so that held me up till i realised. Once i got it on, i couldnt get the back of the top to pop down, but there are two holes in the back of the top on some tabs with matching threaded holes. I ended up getting the top pushed down enough to get some screws in there to hold it until i could get the tower bolted down.
I also left the plastic sheet on the top until i was ready to bolt the tower down so i wouldn't inadvertently scratch the top while working.
Top on and tower bolted down
Finished with kegs sitting in there
Thanks again for everyone who has contributed to this thread. Without others hard work, it would have been a disaster to try it for a first timer like myself.