Look for shielded magnets as we have discovered that strong magnetic fields above the work cause problems with any fast moving metal parts (like fans) and you will need these as early as you can preferably of 
maple plywood or 1/8" Baltic Birch if you happen to find some in a hardware, or hobby store.
For non- sources you might find these folks handy as they are among the best price, reliability, and array of species available and you can put the pass through to use as most is 24" long.