Remix of Bottom plate for Stevenson screen for wireless meteorological sensor

I saw where someone else had made one of these with the bottom plate to fit a 3/4" PVC pipe, but did not see the source files. It was easy enough for me to make this change, but thought others might like this modification as well. See http://www.thingiverse.com/thing:83969 for the other parts & instructions. For this bottom plate, either print the file Bottom_With_34_PVC_Connected_rev3_repaired.stl or regenerate this with the openscad file. The Original_Bottom_part.stl is used by the opensca