You might check Homeworld Remastered. It is an older game that was, well (lol). I am not sure I would call it turn based as in it waits for you to make decisions before counters and such...but your ability to build items is based on time (rounds) and resource. It is quite fun, but for me the learning curve was high due to my not having played anything exactly like it.
The map is fully dimensional as you are in space so, there is no up or down, neutral position. It can get incredibly complex as you get into it. I personally didn't get too far with it, but I stink at most games anyway, just the same I enjoyed it and was worth what I paid for it.