Nice job,
I am a journeyman tile setter. I use nothing but the kerdi system for showers now There is no reason to use anything els. The foam pans come in enough sizes and it just makes sense to have a single stage drain system. It will last you forever so good choice.
Having said that I have don't many traditional showers before kerdi was around which involved a pre slope, then liner, then drain clamps the liner, this is where the secondary weeping holes drain the mud bed, then a sloped mud bed made with dry pack mortar, then thinset and tile. I always formed my curbs and used drypack and ran the liner inside the curb. 2*4 curbs are just not good, 90% of shower failures are because of a 2x4 curb. Having said that there is a proper way to do it with 2x4,s and its wrapping the liner up over the wood, folding a piece of lathe around the curb to hold it in place and screeding 1.5 to 2" of mortar over the entire curb. This is all very time consuming and a multi day process. Now you have a thick mud bed that gets saturated over time with body oils and bacteria and just gets gross and stinks.
A kerdi system or any surface based waterproofing solution is what should be used now.
Just my opinion as well as some facts
So good choice, you obviously did your research