You need to apply transforms on the armature. It has rotation and scale. This is throwing everything off. Also make sure to clear all parenting(Alt+P) on the objects and the rig. Delete all the vertex groups and all armature modifiers. On the meshes go into edit mode, select all vertices and press m->by distance. Then press shift+N. Tab back to object mode. Select the armature and ctrl+Tab into pose mode, select all bones, press ALt+g, Alt+R, and Alt+S. Ctrl+Tab back to object mode. Select All Mesh objects. Then Shift+Select armature object. Press S20 and hit enter to scale everything by 20. Then press Ctrl+P->Automatic weights. Press alt+s to return everything back to it’s normal size.
