Shed design

I am studying this series of 16 shed-building videos: https://www.youtube.com/user/CountryLifeMedia.
Matching plans
http://countrylifeprojects.com/shedplan/
and sketchup 3-d models
https://www.youtube.com/watch?v=BWqsp6RnTgY
excel spreadsheet ready to go

http://countrylifeprojects.com/shed-project-costing-sheet/