From the KRA # 5 disc, as well as other sources. There certainly is vast diversity in architecture regarding the originals on that disc isn't there? I bet some of those guns were real cheek slappers, just the way us modern builders seem to get womped with our Lehigh builds. They ain't easy to build that out of them are they?
The Rupp guns were generally heavier than the Molls, (the 2 best known "Lehigh" builders as far as their style is concerned) and for sure the Kuntz guns (more svelte / less Germanic). He (Rupp) very likely could have, and most likely DID build some fowlers. Key to a faster mounting gun will be less protrusion at the toe area to hook it under your arm. That feature makes it a nicely AIMING rifle, but a lousy POINTING shotgun.
You obviously have a very good understanding of the Lehigh / Bethlehem / Allentown architecture, and what makes it unique and tough to pull off just "right"--what ever that means.