.....calling to mind,maybe some springing thoughts,related to a possible simplified gravity motor,you can look on with wonder and pleasure at : www.youtube.com/watch?v=VAkyRia4UV4
Then,to clear up the first line of a "paper plan",we need no more that :
-a fulcrum,support.
-a lever (constant arm+variable arm )
-two masses
All the best! / Alex
.....this time,in a day light about our day and night "dream machine" (gravity motor) at:
www.youtube.com/watch?v=2smT3quuiRi
The suggestion can be to minimize the design of a possible gravity motor : a "minimum wheel" with a single variable spoke...that is in fact a lever with one variable arm,only.
This park-game machine has a common power supply.
Can we imagine as a power supply,the gravity motive power...starting with and imitating the first line design of this swinging amusement big "toy"?!
All the best! / Alex