Step 1: Parts list
So, an approximate (because it depends on the size you want and what you can find) parts list:
2 pieces approximately 12"
2 pieces approximately 14"
2 pieces approximately 20
3 pieces approximately 18"
assorted little pieces
a piece of cloth approximately 18" x 28", preferably stretchy
Step 2: Assemble as shown
1- is to brace it.
2- is to raise the bed above the heating radiator. If you are just making a hammock, you won't care about this function.
Make sure the appropriate corners are square.
Use a dab of glue, then clamp it or wrap it with tape, and set it aside overnight. Do the same for the other (mirrored) side. Don't try to do all of it in one day, it just won't work.
After you have let it set overnight, attach them using 3 horizontal sticks. Here, SPACING MIGHT MATTER. Remember that I made it to fit above/behind a radiator. The spacing is based on the ridges of the radiator- see photos to see what I mean.
Step 3: Cut out a piece of cloth to suit.
Make sure the tabs are long enough to wrap around the horizontal frame members, plus about 1 inch.
Step 4: Additional diagram of the bed
Loop it back underneath itself, then sew it in place. If you have access to a sewing machine, you may want to sew the pockets first, then insert the sticks, then glue it together, in that order.