Nail-less, glue-less almost screw-less fire finished bed

Step 4 This is the almost screw-less part of the instructable, the side board

You will need to attach a side board in the inside of the "square" you've just finished so take a 1" X 3" X (lenght of your mattress)' and screw it to the inside of your, almost finished, bed using 10 screws on each side. This board will be used to support the boards (plancks) that will hold your mattres, so it must be well screwed unless you want to fall through your bed in the middle of... the night.
You also need to leave about 2 to 3 inches from the top to fit the plancks and your mattress so that it will not slide while...sleeping.
Once again just look at the pictures and you will know exactly how to do it.... really easy. I don't think there's need to explain how to do the transverse plancks, is there? just make sure your 90ý cuts are good enough