It was a little while in the making, but the structure is completed.  I'm just waiting for the soil to settle a bit and for a bit of the guinea pig manure + bedding to accumulate.  The only steps that remain are to apply compost and this guinea pig mulch, then plant!

Materials were taken from the construction site across the street, and fill was scrounged from around the yard, mostly.  Some composted manure purchased locally was added to the mix, as well as wood chips- there's quite a bit of space to fill for the residential gardener with limited biomass on site.

Check out my website if you want more details on the process:

http://livesimplylive.com/herb-spiral/

Peace~

Anton