I've got one of these on my desk and I can assure you that it's amazingly solidly built. Evan and Mike have tweaked the dimensions just so that the plywood they use, sanded and waxed in the way they sand and wax it, fits very precisely -- or rather, it doesn't quite fit, unless it is squeezed a little bit, which is actually what you want, because that means it snaps together securely. And this is why the laser cutting is necessary: it's the one technique that lets you achieve the tolerances you need for this sort of thing without manual adjustments to each piece.