I just finished my own mini-kegerator build with a two-perlick tower rig. You're so right about the hidden costs of these things. Got the fridge for about 200 but then you tack on all the kegs/CO2/faucets/tools/etc and it really adds up!
Are you going to insulate that PVC pipe or just blast cold air through? Or just leave it be?
Come on over bulldogbrewhaus, I sometimes work in Stoney creek and waynesboro. I also go to CAMRA (Charlottesville beer group)I am going to use a combination of regular wall insulation and spray insulation to insulate the coffin box.