Plumbing help

[Jake_the_reefer]

So I am completely new to plumbing tanks I am about to start my first one and i will be using an internal overflow box with a hole that leads down into my sump. I really want to see if I can get away with drilling one hole and have an east point a to point b pipeline. I have a 60g cube and I plan on pumping anywhere from 400-600 gph. Would the example system I provided be a viable option for an overflow? Sorry if this does not make complete sence I cant seem to wrap my head around it

 

[Bryson.bobby]

Looks good to me. How many gph does the manufacturer recommend?

 

[Jake_the_reefer]

Looks good to me. How many gph does the manufacturer recommend?

This is an example :) I havent found the right piping or bulkhead yet, however my overflow box is rated for 1000 gph