Vanilla Expanded team has in beta in their discord an expansion/rework of the gravship. It reworks the grav engine, and has three different variants of them that like some of the other mods also has extra features like power generation from it. Though also those variants are of different sizes as well. So you may wish to check out their beta, and or look at option to not directly modify the grav engine for compatability with it and other mods that modfiy the grav engine. Just a heads up because I love what you are doing with this mod but do want to be able to do both and not have to choose one or the other.