Fuel cell install questions(pictures of members fuel cells)

Hey guys, ive done many modifications on cars before but ive never put a fuel cell in the trunk. The cell i have is 20 gallons and has a rear sump. My question is does the sump have to be facing the rear and whats the best way to recess it? Im thinking angle iron frame but i dont want it to look tacky. I cant drop it to low because im doing a custom center exit exhaust. Does anyone have pictures of their fuel cells? The trunk floor is out and im ready to start. Just looking for ideas. Thanks