I think its a great idea
Only problem i forsee(if infact you use it in a game) is that if you get a direct hit on the camera lens,your blind.
I always used a long length of thin acetate over the lens on my CamScope, especially when testing on Melons etc close range as they tend to spray a bit!
On two motorised rollers rollers, so you wind it on like film in a camera, when it is dirty....same thing on F1 cars on TV
What sort of Stepper Motors are you using Morrolan?
The one in The Jackal was pretty good, but was automatic weapon...fun, but not Cool.
The one in Shooter, single shot, which is very advanced, is Cool
More my cup of tea.