Building a stainless steel gas tank questions..

[abadsvt]

Well the other day i was about ready to call Fuel Cell Guy to finally order a gas tank when i thought, why don't i just build one. I deal with stainless alot since it is my business. I own a HVAC (Heating and Air) company and i have all the tools to bend up, shear, and weld it together. The problem is that i have never built one nor do I know what is important when building a gas tank. I have a ton of 18g stainless from a left over job. Is that thick enough? I don't plan on building a big tank but something around 15gal. I figured that if it doesn't come out perfect i can always pay feul cell guy to build me one. So I want to give it a try. Does anyone know of a link or pictures of what is inside a gas tank. I know there should be baffels to the gas doesn't swash around but what do they look like? What internal fuel pump should i go with for a fuel injection motor? Any comments or pics would be very much appreciated. Thanks alot and have a WONDERFUL CHRISTMAS!!!!!!

Josh