Plans for building RV sheds, pads, etc.

I just ordered on of those metal sheds for my pad. I have a 20x40 pad, electricity, septic system, satellite TV, water supply, but leaving it on that pad unprotected from the weather had taken a toll on the roof and graphics, so after 4 years, I decided to put the shed over the whole pad. Hopefully, this will be a welcomed addition. We are adding partial walls down the back and one side where the afternoon sun is the worst. The side posts are 12', then the where it starts the roof, it goes up another foot before starting the horizontal climb to a 14.8' center.