Tiny dimensional lumber shed - PEM BB building.straw.tinydimshed

This is a badge bit (BB) that is part of the PEM curriculum.  Completing this BB is part of getting the straw badge in Building.

While building a house may be out of reach at the moment, let's get some practice putting together smaller structures.  Maybe your new garden needs a garden shed.  Or you need a place to keep the tools by your chainsaw bear carving station.  Or to hold campfire wood out by the fire pit.  Let's build a little shed with dimensional lumber!

Here are some pictures of something like what we want.  All they need is a moveable foundation.  Sloping the roof to the back gives better access and fewer rain drops dripping on your head.
 
 

Minimum requirements:
  - At least 6' headroom inside
  - At least 6' wide
  - At least 3' deep
  - Made from dimensional lumber (framing and walls)
  - At least three solid walls
  - Skiddable/rollable/moveable foundation (not permanent)
  - No wood touching the ground
  - 90% natural materials by weight (plywood isn't natural)

Provide proof of the following as pictures or video (<2 min):
  - Floor structure mostly done
  - Shelter midway through construction
  - Finished shelter
  - If the unnatural materials you used are anywhere near 10% of the build, explain why you fall within the 90% natural requirement