shower pan installation over concrete

I am in the process of building my forever barndo home. My master shower will be 7x5.5. The concrete guy was able to recess and form a shower pan below the finished surface AND he was able to slope the pan from the edges to the center where the drain will be (i confirmed with a level that there...

Hello Friends with Good Advice, I am in the middle of a tub to shower renovation. 1. Plumber dug (10" x 18" ) concrete hole to access drain. (Plumber said NO COVER was needed over the hole. Said vinyl liner with concrete would be solid.) 2. I covered the open hole with a (24" x 48") piece...