Humble, trust me gravity feeding surge tanks doesnt work.
Mike I havent seen pics of your setup but it sounds pretty well identical to mine
I have a facet style pump feeding into my surge tank as well as the fuel rail return and a bosch 044 style pump feeding from the bottom of the surge tank and the overflow goes back into the filler neck
I have mine mounted in the back off the wheel well so its no threat in an accident
I toyed with the idea of an intank pump, its not that difficult, most intake pumps just need a mounting flange on the top of the tank, all the wiring and piping go in through the pumps housing itself not the tank
mainly the noise that annoys me, my lift pump is quiet as a mouse but the bosch buzzes fairly noticably at times
I've got my radiator sealed off with marine ply so there is no heat transfer and all the heat goes out the bottom and cant enter the trunk area
has worked well for over a year and 7000kms so far