Show Blueprint Extension - Vanilla-Expanded/VanillaExpandedFramework GitHub Wiki
ShowBlueprintExtension allows you to show a building's blueprint when it is in ghost (placement) mode
public bool showBlueprintInGhostMode = true;
It is a def extension, so you just add it in XML in the <modExtensions>
tag. For example, this is the factories in VFE Mechanoids
<modExtensions>
<li Class="VEF.Buildings.ShowBlueprintExtension">
<showBlueprintInGhostMode>true</showBlueprintInGhostMode>
</li>
</modExtensions>