how does this plumbing look?

[usctom]

I would loop the manifold so you don't have the end cap. Should also help with keeping even flow to each valve.

 

[mellotang]

Consider putting something on all that sheet rock to keep the salt creep off or you are going to have "sheet rot"

 

[james1990]

I think I agree with looping the manifold into the return on the display but I didn't do it because the manifold is 3/4" not 1" like the rest of the return.

Is it better to keep the 3/4" manifold on its own Tee and continue the 1" to the top of the tank? Or better to go from 1" into the 3/4" manifold and continue the 3/4" to the top of the tank?

I already bought the plumbing as well as the 1" eductor but I rather do it right the first time.
I am worried about keeping the flow rate of the manifolds consistent.