Step 1: How to begin.... What you need
1" board will make a stronger more sturdy bed so I recomend those. You will also need about 20 screws, and 3 or 4 hours of your time.
To make the fire finish you will also need a plumber's torch or any other gas torch but of course this is optional.
ONE MORE THING... REMEMBER TO TAKE ALL SAFETY PRECAUTIONS DURING WOOD WORKING
Step 2: Measuring and Measuring and then cutting
Mark the boards with a pencil on one side and measure the lenght and width of your mattress. You need to measure only one side, obiously the other side should be the same (unless is a weird non-square mattres)