The 'Tom Threepersons' or 'Slim Jim' straight-up vertical draw rig might be the cat's whiskers for a skinny Matt Dillon facing a bad guy head on, on a dusty street.
Use whatever suits your needs as you see them. Decisions don't require a Anatomy, Kniseology, or Mechanical Engerning background to justify a choice.
Maybe I didn't understand the original post.?
Bread and Circuses don't pay the Bills.