Yeah, you read right. Your eyes aren't deceiving you.
Both done with off-the-shelf parts and a little modification.
You can obviously mount a Zulu instead of a NATO -- or any nylon or leather strap of your choosing. The GW3500 Gravity Defier uses the PRW-1300 conversion kit from TikTox. The feet have to be cut off. The GW-9100 uses a standard G-shock (e.g. DW5600) adapter, but the sides have to be dremeled down. Neither is really attractive, per se -- the GW3500 has the divots in the lugs showing, and there is a small gap where the strap adapters don't fit perfectly.
But a NATO is infinitely more comfortable than a resin strap. :)