There is a certain minimum size needed, and as a kobold, your teeth won't be big enough. I actually looked into this. What you COULD do is get a ring of regeneration and skin yourself repeatedly and then eventually make a suit of armor out of it. Or, you could chop off your legs and make a dragon crafted crossbow. I still don't think the leg bone of a kobold would be big enough, even for a short bow, unless it was a very small short bow.
Exception:
You could make a two handed weapon four sizes smaller then you, one-handed three sizes, and a light weapon two sizes smaller then you, so being small size, I believe the best you could make would be a diminutive one-handed long sword out of your teeth. Then you would enchant it with sizing and then use it normally.
Given the cost reduction on diminutive weapons, you might actually save money. The +1 WSA, however will eat up the savings in the long run as you layer more enchantments on it.