Wiring the in and out jacks is always the same. see the guide below.
The only thing that is optional depends on the individual builder in that you may use whatever GROUND sources you like as we have provided many for you to choose from. The closest Grounds to the Jack can go to each Jack sleeve.
Your wiring looks fine and those are grounds that you have connected to sleeve. Common grounding is up to the particular builder’s wiring needs. You could just use the Grounds at the In/Out of the Red Special just like in the image above. The T Pads go to Tip and the Pads beside them go to sleeve aka; Ground. Many ways to do the same thing.