To go gluten free you have to have an area clean of flour contamination as well as screens, utensils etc. I guess the guidelines / laws would be the same there as here in Australia.
The other option is to buy ready made bases (frozen) that a individually packed and you jusy take them out as you need them. Saves a lot of hassle about the cross contamination issues. All you need is specic bases for the gluten free. Still you have to be very carefull with anything gluten free as some of your products, especially prepared meats, sauces etc can contain gluten traces.
Over here a 12" bases costs $3.50 each. Add that to your pizza price plus a profit component on top of the pizza price and it starts getting expensive. If we could find a cheaper price we would go with it but not at this price, even though it is claimed people will pay the extra just so they can have pizza again, but I’m not so sure.
Check it out with your local authorities before going ahead with it.
Dave