Looks Great to me !
When I had a set of bluing tanks I also had a cast iron pot that I heated with a propane fueled single burner. I would use this with standard bluing salts. When I was just doing one handgun I would use this set-up. Usually I would blu several guns at one time as heating the tanks just wasn't practical for onesey jobs. I never liked the rust bluing process, not that I didn't like the end result, I surely do but just so much easier with the conventional bluing salts method.
Ya got me thinking though, perhaps I should set up another cast iron bluing pot for single handguns. The last handgun I polished I had blued by a local shop for a $50 bill. I already have a 40 pound propane tank and the burners and pots probably could be had for around $100 or so...Hmmm. "Burners" as you need one with plain boiling water to remove the salts once out of the bluing tank. When I used the pot before I did use my rifle sized tank for boiling water. Don't know if I have enough room in my current workshop but I'm surely gonna do some thinking on this.
Once again, great job, keep up the good work !