Gv-IM: Has the time finally come for Gv visual imagery tests?

In our 2018 CHC chapter  Joel Schneider and I made our long standing affection for visual imagery (Gv-IM per CHC taxonomy) very clear.  See text excerpt below. (double click on images to enlarge)

Today I ran across a potential free PDF book (via Research Gate) that may make IM tests viable.  There is hope.