I am not a mechanical or aeronautical engineer but this is my understanding of pop rivet. Their main strength comes from the stem and unless there is a way to secure the SS stem in place so they cannot come out, they will not be considered structural. Cherry rivets have this little locking gadget that secure and lock the stem in place.
The strength of pounding rivet comes from the fact that it swells up and fills up the hole completely, without such properties, it is not considered structural.
RV14 is an acrobatic plane where as RV12 it is not, light sport category.
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying