Finally finishing out my basement. The builder stubbed out the DWV in the slab before pouring it. There is no pit to accommodate the tub drain that usually sits below the floor level of the tub. My 2" drain stub is even with the floor. Anyone have experience using a AFR tub? My concern is having enough room to pipe up the drain to the 2". I was planning to install a 1 1/2 inch trap pipe nut at almost slab level. Thanks for any wisdom.