I'm currently working on a personal mini-mod for vanilla RTW to balance Romans and bugfix, and am wondering if its possible to fix the shoulder armour layering/clipping error on Legionary/Praetorian Cavalry, and if it is, how?

I've managed to fix Velite Gladiators by reading the modding tutorials and altering their manica arm, I'm quite lost now, but is this possible for the more complex Cavalry Riders too?

I'm sorry if I'm being vague or mixed up with terminology, I have very little experience of skinning/modelling, etc.

Any advice is appreciated!