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Adequate ventilation?
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Double this!
The fumes can cause a double hazard along with the powders. Both for the fire risks and for inhalation risk factors. I would spend the extra money and replace every electrical outlet and switch with the industrial grade ones (with green dots)that are rated safe for use in hospitals around oxygen. Less spark risk and heavier duty.
I can't find the example I want right now but there are several articles about people who had an explosion in his workroom/mancave. This might be it but I think there was another one
https://www.ar15.com/archive/topic.html?b=6&f=46&t=380314
and
http://www.thefirearmblog.com/blog/2012/10/02/gun-room-explodes-injures-wife-of-idaho-state-representative/
That will at least give you some lessons from the hard way without paying for it yourself.
Dedicated work areas, especially if you have several of any type of firearm and/or like to build a lot/swap parts a lot. Running in a nice power drop separate from the house's main electrical. So you don't brown things down if you fire up a welder , any milling and/or drilling machines. Likely the room was wired with all the outlets on the same breaker and possibly the lighting. So a few home runs back to the breaker box might be called for and of course use 12 gauge or 10 gauge wire for the 20amps. Better the breaker and outlet be the lesser rated equipment than the wire that will be harder to check. Use rated for hard continuous use at ____, not just short peak loads at _____. The difference is you could run it hard and have long life, buy once grumble once here. The price on wiring will confuse you buying larger amounts is way cheaper,you can second circuits for a little bit more. The cost of cutting, assembling shipping, storing, stocking, then out to the sales display area makes up a large part of the shelf price. No one has ever griped about I have too many free outlets or spare overhead in my work area.
If you planning on a gun safe make sure you take into account the door opening fully.
Since there are no windows I would suggest a real(hard wired) backup battery emergency lighting system unit or at least buying glow tape(theatrical supply if not at your hardware store) to mark the door and any step edges until you are back where you can have illumination from the house windows for power outages. Use of a lighter would be very bad with solvents and reloading.
Also have storage a couple of inches off the floor, unless it is a sealed container. Even then a little air flow for humidity and such underneath wouldn't hurt. A small sacrifice for some risk elimination, it won't help with a full flood, sewer back up or busted pipe but for minor Murphy's law type events it gives you an edge.
Never forget that the ceiling can be used for display space.
Congrats on your purchase and setting up your own room. Which will be a life long job of perfecting it as you grow and interests change.