2. I would strongly discourage drilling holes for the shank(s) before you need them. I would recommend drilling only the holes you need for now, but lay it out such that you can add more later and still have it look good. I built my kegerator with an upright 'fridge that already had one hole drilled for a faucet. I laid out a few different patterns using masking tape, then put a piece of tape on the inside with the center to center measurement (If I remember correctly, I went 2.5" on center with 3 taps initially. I plan to someday expand to 5). When it's time to add a faucet, use blue painters tape in an "X" pattern in the area where you need to drill the hole, then you can mark the center, and drill the hole with minimal scarring of the finish. Also, when your pilot bit breaks through the collar, finish the hole from the opposite side to minimize tearout.
3. I used "Rustoleum Appliance Epoxy" from home depot. It came out really nice, especially considering I didn't do a very good job. 1 quart was enough for two coats on a standard size upright fridge, with some leftover. I used a 4" foam roller and applied the second coat perpendicular to the first. There were a few imperfections that I could have avoided and/or repaired, but it still looks nicer than my regular fridge. If I wanted a concourse quality finish, I would have done a wet sand or scuff between coats to fix the few runs and fisheyes that I got. As it is, I'm the only one who's ever noticed them.