That looks really nice, I need to do a new tank. I have a sump a friend of mine and I made that didn't turn out as we wanted it to. Its amazing the amount of baffling we have in the sump and you can still hear the pump change tone when you get on the brakes, even with lots of fuel. It doesn't cause a pressure loss but something changes because you can here the pump when you normally can't.

I need to work in a tank like you have made but under the car.