Tank Farm

[makigono1]

Hi Folks,
Yet another silly question: I can't seem to find anywhere a building object that is suitable for modeling a tank farm. I've found a big cylindrical building (Desert Tower) that I could reskin by editing the appropriate DDS file, except it's about twice the height I need, relative to it's diameter. I haven't a clue as to how to create a new 3D object and then skin it, and the tutorials I did find didn't help too much. Does anyone have such a building already created that they would be willing to share, or do they have some instructions that a simpleton like me could follow in doing modifying a copy of the existing building? Thanks.

Update: Okay, successfully re-skinned an existing building (desert fort tower) to look like an oil tank. It's my first effort at this, so be gentle. Now, to find smoke stacks...