Cooking over gas heat register on floor

Here's something different--has anyone besides me wondered about cooking over your floor register, if you have that type of furnace? I know I'm weird, but I finally got brave enough to try it. It's VERY slow cooking, and the temp doesn't get very high (I'm experimenting with ways to fix that), but I made a DELICIOUS baked sweet potato.

I have also built an inexpensive solar cooker--easy to make too. I'll be trying that out in the spring, but expect to have good results.