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 main difference being an increased door height of 2040mm and door thickness of 40mm. Fire door standard sizes. All of the standard UK and metric door sizes are usually available as a fire door equivalent with the only difference being an increased door thickness of 45mm.