Hi, I've been checking some of the posts in the other thread. Quite ambitious for a single developer to take this on, so people saying you require a team just gives an interest in just how much others want to see this game come to fruition.
That said, and this coming from past experience in the games industry and an even longer experience in 3D, I would be inclined to see base gameplay in action before starting to dress things up. From what I can tell you have a very clear idea of what your vision is, which may help through the concept stages, but at the end of the day, the art is there to support the game, not the other way around. Again, this is under the assumption that it's still early in the development cycle.
Funnily enough, for a year I've been teaching students how to use Unreal Engine 4, and I can tell people that A) it's very easy to use to set up something basic but B) very tricky to try to set up something more complex. Suffice to say, I think it's the best engine out, both in terms of application and price
So I wish you all the best on this endeavour, whether teaming up or flying solo. Either way, you're going to learn something valuable from this experience.
Just remember to stay within the scope
That's my two cents.
