Get production details for SketchUp-imported shutters

Shutter designs can be brought into Infurnia by uploading a SketchUp (.skp) file, but imported shutters do not generate production details.

1. Shutter designs can be brought into Infurnia by uploading a SketchUp (.skp) file.

2. To get production details for shutters, model them with Infurnia's own design tools instead of importing an .skp file.