Step 1: Lay It Out
lay down two perpendicular lines in a cross. Now place your square against two lines and hold or clamp in place.
For the trammel bar I bent up the end of a strip of cardboard and taped on a fine point sharpie. then I punched holes and inserted sharp pencils for the points
For the points you need to measure from the marker point to the pencil hole 1/2 the major axis and again for the other hole 1/2 the minor axis. In this case I wanted to overall to be 12" x14". so the pin holes were 6" and 7" from the marker tip. that's pretty close together to and makes it a bit tricky to operate, but You can do it.
now poke your pencils or whatever you are using for points through the holes and run them along the legs of the square. start with one point at the corner and draw it down the vertical leg while the other is run across the horizontal leg of the square. If bothpoints are kept tight to the square, the marker will have traced out one quarter of an elipse.
Now just flip the square to each remaining quadrant and lay out that section of the oval.
Step 2: Cut It Out!
Step 3: Put It Together
wrap it tightly around the oval and mark the overlap. You want it to be nice and snug.
Glue and staple the overlap together.
once the glue has dried a bit, press that ring down on a hard surface and push the oval piece into it until it is flush with the bottom of the ring. Use some tape to hold the side and bottom together. start by putting a piece of tape about 4 places around the edge and then fill in completely. Pull each piece of tape up tight and smooth it down nice and flat.
Now turn the box right side up again and run a bead of glue all around the junction on the inside. When the glue is dried, the box part is done.
Step 4: The Lid
To lay out the lid, put the completed box on another piece of cardboard and mark around it.
Hold the pencil flat against the side of the box so that the lead actually marks about 1/8" outside of the box. now duplicate the instruction for the box to make the lid.
Step 5: Decorate
I've given you the structural part, you supply the creative juice.