The three pieces of poret are not meant to be baffles. It is placed like that so all of the water flows through the poret before continuing over the 1st baffle.

Do the baffle position's look good? I spent 3 hours researching baffles and this is what I came up with, not sure if I am overlooking or not considering anything.

Sump will hold about 18 gallons give or take, return section can hold 4 gallons and I have 4 inches extra for overflow protection which is probably overkill.