How to build the roof of my world?

The roof of my world can be made with wooden ladders through the following steps.

The first step, after entering my world game, find a clearing.

Step two, take out Shi Zhuan.

The third step is to build the walls around the house first.

Step four, then take out a wooden ladder.

Step 5: Put the wooden ladder on the Shi Zhuan, as shown below.

Step 6, find the elephant board and put it on the Shi Zhuan behind the elephant ladder.

Step 7, after setting, as shown below.

Step 8, then put the elephant wood ladder on the elephant board.

Step 9: Put everything away.

Step 10: Place the board again according to the previous steps.

Eleven steps, this place is like a plank.

Twelve steps, and then put the elephant wooden ladder on the elephant board. Half of the roof has been built here.

Step 13. The roof on the other side is also placed according to the above steps.

Fourteen steps, and then dig out the boards inside.

Fifteen steps, the roof of my world ends here.