First of all. The one that you listed from Tower Hobbies is one of the biggest rip offs I have seen in a long time. Good grief, $120, sheez. That's more than half of what I paid for my entire setup. The board is only 48" long, which isn't big enough for some wings. There aren't enough fixtures that come with this setup to even build a vertical stabilizer, let alone a wing.

Where to find the metal?? Heck, that's the easy part. The magnets are the hard part because there is really only one place to order them from. Look in your yellow pages under "sheet metal", "metal", "steel distributors", "steel fabricators", etc... and you should be able to find a supplier for the metal part of it.

Ken