Well the only help I would need is making new models and scenes.
Regarding RTW my idea is to overhaul the vanilla with AOR system, specific faction governments system, colonies, new buildings, overhaul units removing some illogical ones and adding new ones and maybe make the Senate playable with a specific gameplay. I'm thinking using Mundus Magnus v1.2 as base as it is already a big improvement to the vanilla and would save me a lot of work. There are many great mods but none that improves the vanilla in the way I idealize in the strategic map. Most mods either change factions, remove Senate, add too much or not much at all. Although I never released a Total War mod I have experience modding to myself.