Paolo Groppioni is very satisfied with the progress that the GRP A4 series 2013 has made up to this date. He has kindly provided the following pictures of production. From wooden cases and filter boards all the way to full-fledged A4 synthesizers: just feast your eyes!
Link: GRP Website
Link: Youtube Video GRP A4 Production 2013 (by Alessandro Groppioni)
Link: GRP A4 Review / Soundfiles