it will, but seems like a complex array of pipes. i would try to simplify, maybe have one return and one outlet, not really nessary to have two, but its your tank. also i would swap the bio balls for something else like matrix or scoria. For one from your pic your last tier will be submerged and bioballs or pot scrubbies do not breed backteria very well when submerged du to lack of oxygen.
Im designing my own sump also and am going to have an outlet either end of the tank but have the return at the centre of the tank thus alleviating the want/need for 2 returns. either way dude good luck.