I recently used Blender to visualize a design for a mulch basin perimeter that I discussed with someone. The design consists of 7" x 9" railroad ties, 3.5" x 3.5" landscape timbers, and 1/2" steel rebar.

Here is the design in Blender's Quad View, in printable black and white.

quad-view.jpg

I used the MeasureIt add-on to display key measurements.

measurements.jpg

The view from underground shows approximately what will need to be excavated during installation.

underground.jpg