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.
The width of the fire pit wall should be a minimum of eight inches for seating, but 12 to 18 inches is better. If you do use the wall as seating, build the pit wide enough that anyone seated on the wall is 24 to 36 inches from the blaze itself.