I'm doing all of my work with expansion PEX. I'm a little puzzled about how to finish the valves where the toilets and sinks connect. Are you supposed to just leave the plastic visible where the valve is sticking out of the wall?
The pex usually goes into fittings that are set into the wall.
I used 1/2” elbow fittings well secured for two sinks and a shower. For the shower the fittings had to be on 153mm centres and a bracket was made for that.
Here is a link to the type I used: https://www.hornbach.ch/shop/Raccord-de-serrage-angle-de-mur-16x2mm-1-2-IG/7011451/article.html