Thanks everyone. Mark, your project was very helpful, thank you.
An update just isn't the same without photos, but there's not a whole lot more to show at this point. Now that spring is here, I won't be able to spend as much time working on the rooms. In fact, I won't likely finish the room until later this fall, which should be fine now that winter has passed.
I'll cover a few minor details that have come up in the past few weeks:
-Illuminated Switch for Make-Up-Air Heater: The heater actually has a high-temp-shutoff safety feature, but I still wanted a reminder in case I left the switch on. I used the Leviton 1201-PLC (Illuminated ON).
-Exhaust Fan Noise: At full speed, there's more noise in the room than I had anticipated (as well as noise upstairs). To reduce the noise upstairs (which is mainly caused by the joists vibrating), I will use felt pads as damping mounts so the wooden frame doesn't transfer as much vibration. I also expect this to reduce at least some noise that carries to the cigar room, but I haven't determined what's causing most of that noise. There will be different solutions depending on the specific causes.
-Switch/Outlet Sealers: Sealing electrical switches and outlets helps provide a barrier between cigar-room air and the rest of the house. A tighter seal means a more effective exhaust system, a more efficient make-up air system, and less room for potential complaints about smoke in the house.
Stay tuned. My updates will probably be less frequent for a while, but I'll post them as I make progress.