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First, choose a strong sturdy material for the frame. These frames are from 6/4" pine. Using the mattress measurements as a guide, cut the wood for the frames.
Draw a curved form onto the long side pieces and rough cut with a jigsaw. Using a flush-cut router bit, clean up the edges to create a clean, uniform look.
Attach the pieces together to form the frames. Cut and attach 1x2 strips to the insides for mattress supports. Next comes the corner posts. Cut four 4x4 pieces to the height you want your bunk beds to be.
To join the beds, create a mortise and tenon joint. First, use a scrap piece of wood to mark out the width on one side, then flip it over and mark the depth of the frame on the next two sides. With a circular saw set to the same depth, make small cuts on both sides. Then chisel until smooth. Next, pre-drill holes and then attach the posts to the corners.