10 points please teach woodworkers, how to make a wooden box (for the dog to do birth box)

Such a big a bit of a waste to do a rectangular better woodworking board specifications are 122 * 244cm * cm can do 1.5 * 1.22 meters rectangular.

First cut the board

1 1.5*1.2=1 piece

2 0.5*1.5=2 pieces

3 0.5*1.19=2 pieces

4 Note that the boards are calculated at 15mm thick

5 Then connect them with nails (5cm)

6 There is no design of the top cover and ventilation opening