Using an in game placeable garden shed, exporting from the Giants editor & importing into Blender.
Separating the parts i want color selectable & moving uv islands to there new locations to work with the building shader & script.
Creating second uv map required by the building shader.
Exporting completed changes from Blender back into the placeable & applying textures & the building shader, testing color scale attributes for each part.
Taking the required info provided in the example xml & adding it into my own, making the necessary changes to suit my placeable setup.
With my new placeable mod & the FS22_TH_PlaceableColors mod both in the mods folder, testing all is working in game.
Using the uv layout as a guide making changes to the diffuse texture to remove the green color info, (Changed to black & white) but leaving the remaining color there for other parts that still require it.
Retesting in game for completion & final result.
Where to find Placeable Colors mod
https://thundrfs.itch.io/fs22-placeable-colors
Where to find & download Giants tools
https://gdn.giants-software.com/index.php
Farming Simulator
https://www.farming-simulator.com