When I first started building it, I only had the front section put up. A few of my neighbors asked if I was setting up a gallows. Then I added a 2nd side, which made it a little more "shed like".
Because of the fucked up shape, I knew the roof was going to be a bitch. My game plan was for it to come down to a point. It just took a lot of creative designing to work out like that. No math, just trial and error.
I put the gooved plywood on the outside because it was primer coated. I figured that would keep it safe until I eventually got the house sided. Then I hung this stuff horizontally also, so that it would be "like siding".
This shows the inside of the Shed. I actually enclosed it so that it's completely separate from the under side of the deck. I had to build a surround around the lawn mower, and such, but it worked out well. I also had a bit of a water issue, so I slopped concrete around the outside of the 4x4's on the floor. This way rain water wouldn't run under them into the shed. Fortunately, that worked.
Last but not least, here is the outside of the shed after being sided. I have the one outside light there, and another on the wide back section of it. This way bugs aren't flying around too close to the sliding glass door into the house. I also put a fluorescent light inside of the shed for any type of night time work. Really happy with how it all worked out.