Thanx all!
On doors I've found there's alot to consider....
The door opening must larger then the largest item that you plan on putting in the room.... don't ask how I know,
lol.
Door swing... if the door swings out it takes up no interior room but it takes more to make it flush or inset to the wall and of course if it swings in it will take up valuable space and then ya need to determine which way for the swing go...
Sliders doors or pocket doors take up very little room but do not seal very good, which can be good or bad depending on your situation. I like those best esp for a good negative pressure room but my door connected to my warm boiler room, good for stealth, bad for temps/humidity.
Good luck