Hi Frank, first things first. To repair any chips in your knobs, the very easy way. Get some plastic Epoxy at Lowes 5Min. and mix a small amount and apply to your bad areas and as Brian said you can then sand down. Put the knob in a drill and put the drill in a vice, turn on low speed and work your sand paper. When mixing your Epoxy add a small amount, just a drop of paint (color of your knob or as close as you can get) because the Epoxy is clear. you might need to try several mixs till you get the wright color. Your finish sand paper should be 150. You can then polish the knob to shine. You can always prime and paint them.
Your door will come off but no need, there is a rod that runs up the center. Very hard to remove and no need to do so, you will need to take a grinder or even a dremel with a grinder disc and go down both sides of the hinge till you see a gap of daylight, make sure you remove enough, cut a nice gap. You will never see as the Sealer, primer, paint and clear will make up the difference.
Next, take a grinder and grind a 1/4" + off both corners of the main door till you see a nice even gap and the door closes with no drag. Keep your candy display in as you do this because of the weight and on the left side of cabnet, remove the piece of stainless that the door rides up on or tape it up when painting.
On your main body, take a small flat bar and open the gap a little till your door closes with no rubbing.
Make sure your bodyman skim coats the top and side edges of the machine to cover the spot weldes, this will make for a nice looking finish.
Hope this helps you out. Curtis Kauffman, Memory Lane Restorations.
memorylane@myactv.net