You use concrete! But I guess that was obvious. They make styrofoam forms and you basically do it the same way as pouring a sidewalk except you want a smooth finish. Remember that the base better be able to support some weight! The floor must support the weight also. You could be talking 600 to 800 pounds easily. When finished you must seal the surface. I still don't think you want to get raw chicken liquid all over the surface. I don't know how easily it cleans??? If it were me, I would tell her the floor can't support the weight and put in the usual stuff! You drop a glass or after drinking set a glass down to hard and its gonna break!!! IMHO its a stupid but trendy idea.