lol If you've ever dug a pig pit by hand, you'll understand why I opted for the use of a backhoe! I'll never go back.
This method needs room for a foot-deep bed of hot coals, the pig and another foot or so of space above the pig. So you figure at least 4'.
Many people don't realize that the closer you get to the pit with the pig, the smaller the pit really IS. lol
Same thing happens with my horizontal wood burner. I end up hacking off legs and the head to make it fit!