Mike,
With respect to the guard and cheek rest issue, in my study group of 23 jaeger doubel barrreled wender guns, three have both barrels smooth bored, are half round, have no rear sights, fixed front bead or blade sights, flat toes, and appear to have been made originally as wender fowlers. All three fowlers have cheek rests and raised grip-rails on their guards like jaeger rifles. Curiously two of them are made with double set triggers (with no rear sights, mind you)!!! The 20 other guns have at least one rifled barrel.
Bill Paton