Sancho is a Spanish name and it means Saint. In slang it means the other man, a guy a girl is cheating with. Sancho means sancho in English as well as Spanish. Pearl Yamada.
The general rule of thumb for a horizontal smoker is that the firebox should be 1/3 the size (volume) of the cooking chamber. These are just guidelines based on years building smokers but your mileage may vary! Cooker Chamber Type & Size.
Mark out how large you want your fire pit to be and start digging a hole. Your fire pit should be about 1 foot deep. I tried just using a shovel for this part, but found that clawing with my hoe and then hoisting out the loose dirt with my shovel worked better.