OK, so I have been spending the past few days on finals and familiarizing myself with Panda3D. I have started on a basic 3D object editor using it. Attached is a screenshot. Yes, I know it is very primitive, but until 2 days ago, I knew nothing of 3D programming or modeling (and now I can model a cube and texture it, woo!).
My current intent is to let people click to place blocks, and then I'll export the entire collection of blocks out as an XML file or something and then import that into the server as a template.
Link to pic: https://picasaweb.google.com/101878754950292033544/ObjectEditorPics?authkey=Gv1sRgCNqnm-DX7vbErQE#5601051239965436482