Here is a little slide show of the secret room I made for my boys. It was wasted space over the garage so I cut a whole in the wall and built it up from empty floor joists. The area is about 8x6 but not quite tall enough for me to stand up straight. They were into Lego Batman for the Wii so that's how it got decorated.
Now what you need to do is install a "bat signal" with a switch downstairs, so when they're inside and you need their attention, you can flip the signal and they know to get their butts down pronto.
Fun and nice use of otherwise wasted space! I say all space can be used. Right now I am building cubbies (like the ones you made for this room) under the stairway wasted space. Have you ever thought about building shelves under the stair steps - like they do in ships - like a stairway bookshelf? I am thinking about doing this as well but have not created a plan of action yet! Can't wait.
Very cool. We had a space like this above the laundry room in the home I grew up in--kind of like an indoor treehouse. It wasn't a finished room like this, nor nearly as cool, though.
I really like the "hidden door" and I bet the kids really love it! There was a similar storage nook in my room when I was growing up, it wasn't finished but with a light and some cushions it made a great private reading space
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Maybe now, as a teen, I'll make one for myself, and maybe just not mention it to my parents...
www.instructables.com/id/Indoor_Wooden_Castle/
www.instructables.com/id/How_to_build_a_cardboard_Rocket_ship/
www.instructables.com/id/Water_fountain_ramp_toy/
www.instructables.com/id/How-to-build-a-sit-down-driving-arcade-cabinet/
http://cantyshanty.com/tc/8/
The entrance is the kicker. Awesome.
(actually, you did a nice job here. I'm sure the boys love it.)