jake14mw wrote:When you ask if I am going to bond the box directly, I'm sure what you mean.
No offense, but it seems like this project is a stretch for you. Do you have someone local who is more knowledgeable and can look over your work?
To bond in this context means to provide a low impedance connection (good at carrying current) between normally non current carrying metal parts of the electrical system (like the metal box).
Since you are using a metal box, the ground wire in the 6/3 NM needs to bond the box directly before going to the receptacle you'll be installing. [The screws holding the receptacle to the box will bond the two together, but the bonding of the box has to be independent of the device.] I see that 6/3 NM has a #10 ground wire in it. Your metal box probably has a raised area in the box with a tapped #10 hole in it. It may also have a ground screw in the hole; if not, you need to buy one of these or equivalent:https://www.homedepot.com/p/Ideal-Combo ... /100134430
[I don't remember if it has to be a green screw, I think you probably could use any 10-32 machine screw of appropriate length.] With #12 wire, I would usually just leave the bare ground wire a little long, wrap it in a 270 degree loop around the ground screw, tighten the ground screw, and then land the free end on the device. I think with #10 copper that will still work. Do not he-man the ground screw, it is easy to strip the threads on the screw (but if you do, usually the threads on the steel box are tougher and still OK, so you can just replace the ground screw.)
You could also switch to a non-metallic box and avoid this bonding issue.