Plumbing nightmare

So the syphons

So what size would i have to use for my syphon on this project, 1.5" for the syphon, 2" for the regular drain and 1.5" for the emergency one?

 

Ok so this would be it

That is what you recommend; i want those things in an exterior box , so i don't loose too much space in the tank. The overflow will be a coast to coast 1.5" wide by 5" deep Since the tank is 72" i'm having 2 boxes of 24" X 6" X 9" H on each side. Because, short story; bad back all plumbing will be on the sides of the stand and not the middle. In one box the syphon drains for the sump, the other box will house the close loop feeds. I can work on either seperatly standing up and not on my knees under the sump.





The mesurement , 1.5" for the syphon, 1.5" for the open syphon, and 1.5" for the emergency or 2" for emergency.

For the closed loop is this one ok since its going to be closed.... and i'll have a screen ,i'll have only two but on the side of the box





The over flow



Do you have a pump suggestion for the return, i already have my loop one.