Nice little assistant. I got me four of those

How high and wide do you make your curbs? I will be using cinder blocks to make a bench and wondering if I could use some of the thinner center blocks or cut them with my wet saw. For the subfloor, the 2nd layer of plywood is only screwed onto the 1st and not the joists right? i will silicon my plywood joists and lay the CBU tomorrow morning. with versabond thinset and roofing nails on my mainfloor and in the master bath later this week.

For the plumbing any diagrams on how the best way you would go about settign up the ABS for the drain?