I added a second type of gun, a handgun instead of rifle, and exported a new animation of the gun holder walking with a handgun vs rifle from mixamo. The orientation on import into unreal was different with the 2 models from mixamo, but instead of modifying it in code, I rotated on the import so the two types of walking models matched orientations.
I also recently designed a 3d printed pot for plants that says ‘I Love Dogs’. I did it by using Claude to create OpenSCAD code. I think designing the drone could be done in AI/Claude/OpenSCAD once the requirements for the different components are worked out. It could use the open source commercially viable design I linked earlier as a starting point.