Got the Portible Garage from Habor frieghts.

It's 25' wide by 26' deep. They come in several standard widths and can be any length in 2' increments.

It would not be easy to install windows on the sides unless you were to install thin ones that fit the flat sections of the sections. The front and back would not be too hard. I am going to install a pass door on the front.

Also they sell translucent fiberglass panels that you can replace some of the straight panels with to allow in natural light.