The aircraft is really coming together now Lythronax, nice job so far.
Thinking back to my own project I think the best advice I can offer is learn the mapping techniques you need now before you go any further, map and skin the aircraft once you feel the shape is correct before doing anything further work such as internal details for wings or fuselage.
Once the external shape is mapped and can carry a skin to your satisfaction, as little distortion as you can get and things like rudder and wing stripes aligning, then you can move on to cloning that base shape for the internal skins. Once mapped you can then just colour another area of the skin template to accept what will be the fuselage and wing internal skins, if you go that far that is, and actually make things so once hit all the detail can be seen.
If you are to make the decal system it is better to take it on with only the base shape, I did it late and eventually had to add those areas using the hier, they work but the idea is to have them as part of the skin, there is a tutorial by Champi that explains this process, he was a wonder at describing anything to do with building models although I cannot remember him actually releasing one to us.
Once you start to clone parts to make the inner skins and attach them to the outer you can cause all sorts of distortion issues if you start to move vertices to alter any shape imperfections because if you are not careful it is so easy to move elements of the cloned parts once they are part of the outer skin.
I'll leave it there for now, you have seen my Lysander thread so hopefully my trials and tribulations will have helped you stay clear of making a mess of things like I did.
Take care and be safe.
Wishing you all the very best, Pete.