The next day... February 13th...

Next was the carpentry...  Given the slope, I built a two part frame (all untreated wood - no need taking the chance on the chemicals) - the bottom began as three sided "box" built from 2"x10" lumber.  The top was a box built from 2"x10" for all four sides with two cross pieces that broke the size up from a single 2'x12' to three separate 2'x4' areas.

Turns out that the three sided box did not work as well as both ends were kinda "floppy".  To solve the problem, I added a 2"x4" to tie the ends together.  I then had to do some minor excavation and leveling of the bottom frame.

Now to set the other box on top of the first. I cut 2"x4" stakes to drive in front of the box to hold it in place in case it wanted to slide down the hill.