I had 2 of these built by a local builder, for the time and labor involved it was worth it for me.
I couldn't find plans I liked so I just sketched what I wanted, gave him this picture and let him figure it out.
Anyway, I did this type lean-to so I could put them tight against the back of the garage under the back eave overhang. I have one left hand, one right hand. I used one to get all the lawn/yard tools out of the garage, the other has my Vertical compressor, generator, pressure washer, stuff like that in it.