Hello,
I'm taking the liberty of digging this topic out of the ground. Have your plans evolved since then?
Forest pro is a mature software, there's still room for improvement but it will settle down, the software is mature.
Railclone still has room for improvement and could benefit from a terrain editor, urban at plot scale, quite precise.
I'd imagine a plan editor with precise line control (a la Revit) that lets you edit zones or lines with elevations on the points to create the terrain and place Forest & Railclone objects on it. Max's surveying tools have come a long way and can be used to some extent.
I repeat, an easy control tool for urban & natural zoning is missing and it's a time-consuming and difficult task to get it right. There's TerrainAxe, but it seems a very/too complete factory that must scare users. It should remain a precise but simple management positioning tool for yours plugins, inspired by Civil3D or Revit. I misspoke last time, it's not procedural, rather precise control of zones based on an architect's plan on a small, medium scale.
At the moment, Max is problematic for the task, it's quite unreadable to work with a complete scene and you always have to move 4-5 splines for a change of a few centimetres in one place, select the right spline if the zones overlap, etc. And paradoxically this is partly due to the different, overlapping Forest and Railclone in the scene.
Personally, I'm starting to use Revit for the task as their topo tools have been evolving in recent years, but hey...