Can I convert an old window into a working door for a child's playhouse made from a water tank, or use something else?
I'm building a playhouse from a cube shaped 275 gallon water tank and need to figure out how to build a working door for a small child. The tank will form the basic structure as it is going to be partially buried on one side, like a "hobbit hole" and I figured the tank would be water-proof. I'm still working out the details, and figure the door needs to be at least big enough I can reach in to remove the child easily. (The tank will be ventilated through the filling cap on the top and a dryer vent on an exposed side wall.) I plan to cut a hole in the side of the tank once I figure out how to make the door.
I know this is a strange project, but it should be a lot of fun for my little hobbit this summer, and I appreciate any help I can get!