Building a custom fuel tank?

[tnelsmn]

I'm building a custom fuel tank for my Hydrostream project. Plan on building it out of 1/8" 5052 aluminum. I've built some custom fuel cells in the past, but nothing marine. My main question is should I set up the fuel feed with a dip tube, or add a threaded fitting at the bottom of the tank? I'm planning to use 1/2" NPT weld on fitting for all the ports; feed, return, vent, possibly a drain, etc. Unless you feel I need bigger. Power is a 2.0 175 for now, plans on an EFI 2.5 in the future. Here's my cardboard mock up of how it will fit in the hull. My math puts it around 26 gal. Open to input, thanks!