I got a cell in my turbo Runabout. I'm thinking about taking it out though, since I've done just about everything wrong on the install. There's no tip-valve, no filter on the vent, no emergency shut off (inertia switch), no box closing it off from the passenger compartment, and only a couple big zip ties holding it in place. It's right next to the battery, too, which is in a battery box, zip tied in place with no lid on it. It works really well though, and the car has pulled on my friends 92 Corvette from about 50 or 60. I'm going to be doing a lot of work to the car in the near future, so don't worry...this horror show is going to be addressed.
I want to put in a factory gas tank from a Fox car. It'll fit under there, and the only issue I saw when planning this out was that the filler neck is on the wrong side. I could just spin the tank around, but then the fat side isn't where it should be, and it might be really visible, so I'll probably just move the filler neck to the other side.
Doing this does several things. It will keep me from having to close off the back area, and I'll have some actual trunk space again (face, it hatches are AWESOME for moving stuff), the car won't stink of gas all the time, the fuel guage can be re-hooked up, I can use a quieter in-tank pump, I won't have to fill the tank up by opening the trunk, I can use factory EFI fuel lines (it's 2.3 turbo) and it'll just be WAY less racecar-ish that way. And cheaper, too! Oh, and more safe. I keep forgetting about that one!
If I had thought of all that stuff when I first started the project, I never would have even bothered with buying the cell.