I wanted to get my son a large chalkboard for his room because he likes to draw on a large scale. Unfortunately for him I'm horribly cheap and infinitely bored. Real, good quality chalkboards of any significant size are rather expensive so here is how i made a decent quality one for relatively cheap.
Step 1: Materials
There isn't much required.
48 x 48 piece of 5/8" plywood
48 x 48 sheet of 24 ga. sheet metal