It's a shame that Weber no longer offers conversion kits. All new gas kitchen ranges that I know of come with a conversion kit to switch to propane if needed. But Weber is too afraid of being sued to even sell us a conversion kit. Well, that's what they say. Maybe they figure they can sell more grills if they don't offer conversion kits.
You can convert from propane to NG by switching to a propane regulator and soldering shut and re-drilling your orifices to the correct diameter. It's not rocket science.
You would probably also want the bottle scale to hang your tank on, but they are not too expensive.