A. Take three pieces of pine or meranti planks with a measurement of 2400 x 220 x 22mm and cut into six pieces of 1200 x 220 x 22mm strips.
B. After that, take another piece of pine or meranti plank with the same measurement and cut six pieces of 372 x 220 x 22mm blocks from it.
C. It’ll be better if you also make one 1200 x 1200 x 3mm backing board, but that’s completely optional.