Mary, I'm happy this turned out okay. The only comment I'd make is that I would have closed the draft at least 75% or more. In this case, I may have closed it completely. For sure the 500 stovetop was nothing to be concerned with so you really did not need any draft as that hot chimney would provide plenty even with your draft shut.
Hmm I figured leaving the draft open, cat shut would give me a nice bunch of warm air in the room - making lemonade from lemons as it were.