Good idea, but I must say that the script will be deeper than it seems, adding a new war machine implies breaking the compatibility of several other war machine scripts, also it could break some mods like ACM.

For my mod I have deeper ideas, I plan to emulate some HotA objects with ERM, for example Resource Warehouses, Warlock's Lab, Watering Place and many of the other new objects that appear in the water. I can make them appear by replacing, it is only required to give it function and they would be ready.
PS: I'm not afraid of HotA Crew, my mod is not a complete copy of that game, my goal is to make a clean and true amalgamation of the aesthetics of the game for a wonderful experience in ERA.