F.R.,
Just for the sake of discussion only...
If you want a Sharps rifle but without the treatments/configurations that make it a 'Quigley', you might want to take a look at the Pedersoli LL 780 and the S 774 models, they might have what you are looking for in a Pedersoli Sharps. JMHO, but the Pedersoli company probably paid dearly for the marketing rights to name a style of rifle after the movie character and then packaged it in the closest configuration possible that would be marketable in quantity. If you wanted a rifle exactly like that used in the movie, the caliber would be larger and more expensive to load, as well as the overall styling being a bit different, not sure but a calculated guess on my part. Other Sharps lovers and movie buffs will no doubt chime in with more definitive info and data.
Just curious, but why would you want a 'Quigley' without the patchbox, etc., it wouldn't be a 'Quigley' then, it would just be another Sharps without a patchbox, etc. Are you looking for a Sharps in the 'original' caliber as in the movie? Pedersoli offers the 45-110 and 45-120 in some models, other companies follow their lead but the Pedersoli 'Quigley' in 45-70 or 45-110 seems to be the standard.
Best regards and good looking!
'Ol Gabe