So instead, I decided to get the cheapest primed metal insulated door with the plan to make it a fun focal point in the room instead of a what-the-heck-is-a-door-doing-there eyesore.
We installed the door, I painted the trim and the perimeter of the door in latex white paint to match the trim and doors throughout the house. Then I painted the center with black chalkboard paint. It looked too boring, so I added some high-gloss latex cobalt blue paint that I had leftover from a different project....still boring, and the dark blue matched the black too closely.... so then, I handpainted a apple green stripe around the outside of the chalk paint using good old acrylic craft paint. Perfect!
After the chalk paint had cured for a few weeks (I don't think you have to wait that long, read the can to find out actually curing time) I seasoned the chalkboard by rubbing it all over with the side of a white piece of chalk. Last, I rubbed all the chalk off- this keeps the chalk marks from leaving permanent marks.
I've claimed the top of the chalkboard. Wes colored the bottom with art- his first creation he deemed a "rainbow, Christmas-tree, mountain." Love it!
Oh, and one last thing. Because the door is metal I used an old magnetic locker pencil holder to hold the chalk, and we can also play with magnets on the door! Bonus!