For the base, you notch out two pieces of scrap wood and then hammer them together - - here's a picture tutorial:
It's sturdy enough for my porch - at the craft booth it was windy, so we used a rice bag thing to hold the bottom just in case.
Now that the craft booth is over, I told my kids we could use it for Halloween Decoration. My first grader thought of this all on her own, dictated it to me as I wrote on the sign.
First, these "ghost" footprints she drew leading up to the house...
We are ready for the season!!