Scaling down FFF/FDM version without losing functionality

You can scale down the FFF/FDM version of the model even 2 times and the level of detail will mostly remain the same (except for an antenna - it won't be printed at all) but the joints most likely won't be movable. That is why the author doesn't recommend scaling down the FFF/FDM version of the model since the King Crab may lose its functionality.

Moreover, if you are planning to continue printing the models for your Mech Warrior collection, then you will have to change the size of all future models in order have them scaled according to their actual size. That means that all the Mech Warriors are different and by scaling down the heavy Mech that much you can't be sure whether you will be able to scale the light one as much as it will be needed.