Paul you have done a great job on the recreation of your families 3/4 stocked rifle. Your rifle fits this forum as well as any Southern Iron mounted rifle does, especially since you started this build from a blank. More research needs to be done on the 3/4 stocked rifles. I think that their popularity was a realitively short period, maybe only 60 years or so, they are a definite style of the long rifle.
This style of rifle could have gained some popularity after the Lewis and Clark expedition and their use of the short rifle. I have a 3/4 stocked rifle in my collection that was built as an flint lock and I am positive that was built as a 3/4 stocked rifle originally.
Anyway, nice job.