Tower - PEM BB building.straw.tower

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.  Let's say you need to get something off the ground and keep it safely up there.  Perhaps it's a deer hunter?  Or some food?  Or a big water tank?  Let's build a 4 legged tower that has a useful purpose!

Here are some pictures of what we're after:  
 
 

Minimum requirements:
  - At least a 4' by 4' foot print at the top of the tower
  - 4 legs
  - Platform is at least 8' off the ground
  - Bracing to keep it from wobbling
  - Simple/permanent foundation
  - No wood touching the ground
  - As in all Building BBs, no pressure treated wood allowed
  - 90% natural materials by weight (plywood isn't natural)
  - Metal corner braces can be used if you make them yourself
  - Structures built atop it can be submitted for other BBs
       - Regardless of the foundation type specified in each particular BB

Provide proof of the following as pictures or video (<2 min):
  - Location where the tower will go
  - Foundation in place
  - Tower midway through construction
  - Finished tower
  - If the unnatural materials you used are anywhere near 10% of the build, explain why you fall within the 90% natural requirement