Gentlemen,
Does it not make sense to assume that a master 'smith was capable of building a rifle based on any School/Design that he, or more importantly, the customer wished? Just as today, I think that every gunsmith had favorite design elements that he preferred, and would execute if left to his own devices, but I believe that the "School" that was most often adhered to was the School of the Dollar, i.e. "The Customer Is Always Right."
I think it also safe to assume that there was much restocking and recycling of rifles and parts which can lead to confusion in our modern-day analysis. Especially since we live in a throw-away society; nothing was thrown away by those thrifty Germans. I have a heavy match rifle with a one-flatted round barrel in .62 caliber, full-stocked stocked in walnut, early-style handmade set triggers and beautiful early Lancaster hardware. Superior workmanship, no makers name...but cut with a 1-36 twist for a picket ball and fit with a false muzzle. I reckon this gun would cover just about every School that has ever been discussed...however, I believe it was made for the arming of the early Union sharpshooter units in the Civil War. It is obviously a "parts" gun but of very good quality and obviously done by a master 'smith. This rifle may have been made much earlier as a target rifle and re-worked several times by different gunsmiths and in it's last stages been fixed up for the war. Who knows?
If a customer went to his local gunsmith with hard cash in his hand and wanted a rifle with design elements from another "School" (gunsmith) I'm thinking for the most part he got what he ordered. Just like today...
Just my thoughts,
Steve