As requested by you and Jackmeoff....
At Thai Watsadu they have some bigger ones Pottery deals. Same process.
As a side note: I cut out the bottom using my Makita Saw with diamond blade. I suspect if you try and chip it out you will break the pottery. I started smaller then Thai BBQ coal holder as I wanted it to basically hang as you can see in the pics.
Cheers
Drilled holes to let the juices run out.
I set "Oven" on bricks so the Thai coal BBQ is suspended.
Cheers