[Christ]

Indeed, it's a great time to learn. You can make the shape you want with chicken wire, pull it out, put packing tape over the side you won't see of it, and lay your glass over the packing tape. That will give you a smooth inside finish. Don't forget to lay in whatever fasteners you need, as well, for the lid/lights, etc.

I helped a guy do a set for a 240SX (pig nose) similar to this, but with normal round lights.