After laying my sloped pre-pan and putting down lath over my curb (only place I'll use lath), I'm kinda second guessing myself as to if I did things out of order.

Questions:
1) Do I mud it in and then put the liner over it in that order?
2) Should I have put some felt paper on the wood first to keep the mortar from drying? I'll slope it on top of course.
If I did screw anything up, what would you recommend to fix it?