Thanks for the kind words! The Shotgun was actually done (or at least organized) by S&J Hardware as part of their annual Remington 870 Christmas CeraKote Re-Finishing Special for $250. I included it because it does a good job of showing how the "Cobalt" CeraKote resembles fine Parkerizing.
Sandblasting is definitely the way to go for surface preparation! The 400 grit Emery cloth is a "poor man's" sandblasting substitute for those without the means to blast and has worked well for me in the past. But sandblasting is definitely superior in terms of a consistent finish that adheres to the metal with the strongest possible bond. Just be careful how you hang your parts on the metal hangers and be sure not to touch anything that has been coated before baking and you should be fine! It is actually a very simple process made tedious by the need for precise surface prep with the Acetone bath(s), hanging of each part, etc. Try to have fun with it - remind yourself that the end result will be worth the effort that you put into the surface preparation! I am jealous if you have a full-size oven that will take a Barreled AR Upper Receiver, as all I have to work with is a large Toaster Oven. It works great for pistols, but that is about all I can currently do for size.