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Mine wasn't super heavy, but molly bolts work best if hanging from just drywall. This particular wall is all studs, so I didn't have a problem hanging it. If i was worried about wall holes, I would use a hanger system like they use for cabinetry . . . a backer board if you will. Good Luck and hope your little enjoys your board.
Yes of course you can bake on it. Charcoal briquettes are the fuel you should use. The briquettes go in the pie pans at the bottom under the grill area. I have cooked pizza, brownies, cookies, monkey bread, and turnovers in this oven.
Purple Fig Solar Cooker
Super Secret Book Safe
I built one of these and also made an instructables. You are amazing and your son is super lucky. Don't let anyone tell you it isn't the best thing ever. My son learned caution and fine motor skills his peers haven't grasped. He problem solves better as well. This didn't help his already houdini like skills and I used, as I'm sure you did, parts that didnt match those in my home.
Activity Wall for Kids
Agate Rock Lollipops from Crushed Candy -- Simple and Easy!
How To Cleanly Remove Blackheads Painlessly!
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PIRATE SHIP PLAYHOUSE