Looks nice! All that insulation must have been a pain to get laid in there neatly! I see a little light sneaking out the top of the door frame~ you've checked to be sure it maintains temp even if the room fluctuates some? If not~ do that before you put your valuable eggs in it. Just turn it on~ put a couple set up egg boxes in it just like you would if you had eggs in the boxes~ and monitor the temps for a couple weeks inside the egg boxes. Try to intentionally trigger in room temp changes that may occur while your really incubating so you can see how the incubator reacts. Open and close doors~ windows in the room. Remember that depending on when your girls lay~ you may have eggs in there as late as June or even July~ try to see how the incubator reacts to the room being warmer too.
Good luck!