I most certainly did not do this myself - I wouldn't even know where to begin on a job like this. Had some guys who do tile work and started doing fire pits do it. The brick is old Charleston brick from a torn down schoolhouse. They dug about four inches into the ground, filled with slag rock, concrete over top of that and then the brick. The pit is lined with fire bricks but has a drain in the bottom (accessible by removing a brick) that drains out into my back bed. That makes it useful for oysters (once I get a stainless oyster pan made for it) and even for barbecue should I decide to go that route.
Kamado Joe Classic (Red), Pitmaker Safe on Cart (Brilliant Black Pearl)