First off, it's your gun, so do what you like with it.
That being said, it really depends on what style of rifle it is, and whether you care if it looks anything like an original Longrifle or not.
If you care that it looks something like an original Longrifle, you need to give us more information.
So, what style of gun are you intending to get?
Off the top of my head:
Nose cap:
There are several fowlers without nose caps. Perfectly normal. Is yours a fowler?
Many southern guns didn't have nose caps, and many "poor boy" rifles didn't have nose caps so that is plausible.
RR Entry pipe:
you are pretty much going to expect to see these on every kind of gun, with the exception of some southern mountain rifles and "poor boys".
The nose cap protects the front of the stock.
The rear entry pipe protects the transition from the ramrod channel to the ramrod hole in the lower foreshock. You can imagine trying to quickly put the ramrod back in its' hole and stabbing the exposed wood that is not protected by the ramrod entry pipe.
Norm