James, I have scaled measurements for a John Sheetz and it has a 3 1/2" drop at the heel @ 13 1/2" length of pull.
The comb line is also fairly (straight) being 11 degrees in comparison to the bore of the barrel.
I would suggest that Knob Mountain's (Fred Millers) left hand Armstrong - with it's 4" drop at the heel @ 14 1/2" LOP - when cut back in the butt for LOP would be far closer to the profile you are after - particularly along the comb line (Armstrong/Maryland stocks are fairly close to Sheetz/Lauck Shenandoah style Virginia's).
The LH Fordney shows a 3 1/4" drop @ 15" - that would "flatten out" even more by reducing the LOP, to a drop under 3" - sound a little too "little" for a Sheetz.
On the other item, the Durs Egg should look right at home on a Sheetz rifle. I don't recall seeing a Sheetz rifle with "other than" an English lock, although I'm sure a few must exist.