I used the basic design principles from Ana's site but decided to use 3.5x6.5 round fence posts (purchased at my local Tractor Supply Company) for a different look plus they are a little cheaper than 4x4 posts. I also used pressure treated 2x4s for some added strength and perhaps longer durability. I used Ana's cedar fence pickets idea for my roof (these pickets are used as walls on one of the other shed plans on this site). I didn't need a very robust roof as my firewood shed sits underneath the deck which provides a lot of protection from the rain. I attached the structure using 3 inch deck screws and the roof with 1.5 inch deck screws (nails would have been more than adequate for the roof but I had the screws on hand).
I did run into some problems due to my design changes. Most of my issues involved attempting to square up the round posts which are much closer in shape to a jagged stick than dimension lumber such as a 4x4 post. If I had to do it over again I would not have used the round posts. Constant tweaks and adjustments to the posts significantly delayed my build time and frustrated me at times. I was just barely able to wedge my woodshed in between the 2 deck posts which actually came in handy as I was able to secure the shed to the deck posts with 3 inch screws...making the shed very solid! The final issue I discovered after loading up my wood shed. The 2x4s at the bottom of the structure began to sag. I fixed this by using my floor jack to raise them up and placed 8 inch tall 4x4s underneath (2 in the front and 2 in the back).
Overall I'm happy with the way it turned out and I really love all the plans on this site...GREAT ideas!!