Step 13Holes and magnets
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You'll need to use a template again. Use the previous template to make this one; it needs to be 200 x 200 mm. Make the dowel holes slightly bigger (I used 15/64" for the dowel holes, and went to 17/64" for these). Drill just deep enough for the magnet to sit flush with the surface (conveniently, this was just into the second layer of ply, so I just eyeballed it), but bore all the way through for the others. Repeat 45 times (you don't need to do the base, for obvious reasons!). Glue the magnets in the holes using a thin layer of epoxy.