Oh i'm still working on it, very long haul project, like v1 to v2 was a few weeks, v2 to v3 was a few months, and v3 to v4 keeps that trend going.
You know the deal by now, all my other mods go into mars v4, all the hygiene and water management, irrigation, skylights, resource grids and plastics production from a yet unreleased mod, the rimatomics reactors and fully custom research, whole bunch of improvements to stuff like air code, pipe nets, airlocks, world gen, graphics. For v4 the aim is to shift the gameplay away from doing rudimentary mining and base building and waiting for incidents/ships, to a full progression system, with company management, technical long term goals using the custom research, plant breeding, manufacturing, and eventually tourism, with a healthy dose of incidents and moody pawns to scupper your efforts.
The mods that make up parts of marsx have got probably hundreds of thousands of hours of play now because of their wide popularity, so i have refined them and how i make them a hell of a lot since the early days, the level of quality i'm aiming for is getting there, but i'm not a pro and i'm too stubborn to let other people do anything, so that means it takes a little bit longer than maybe other big mods that are group efforts.
hope that makes sense of it