Building location value of carpenter's coffin

"The coffin is nearly eight" means that when making a coffin, no matter who the coffin is for, whether it is tall or short, the size of the coffin is only eight feet, no more or less. "Ba" and "Fa" are homophonic, and coffins and officials are homophonic, which means promotion (coffins) to make a fortune and places people's good wishes on their ancestors.