If you copy a SKP to change its contents into a something similar you can readily relocate its parts using Move etc, then edit affected sub-components using PushPull on existing faces to change their geometry as desired; or use a left-right fence to select several bits at once and then Move en mass - e.g. a top's end with notches would need all of the notch faces PushPulling in turn until they were are in the right locations, but a select of the affected parts with a single Move will do it in one go! It must be quicker than starting from scratch - you can always add new geometry etc too...