1970 Duster Starter Wire Wiring - Does it Matter?

I will try to get a decent picture tonight if the relay. Let’s say that everything on the relay is wired correctly. If I remember correctly the wiring should run from the battery to the relay and another wire on the same lug goes to the starter. Is this correct? I like having the battery in the trunk and would like to keep it there if possible but I don’t know if that big of a wire would fit on the relay. I would like to leave the large wire straight to the starter as long as it’s safe. Hope that explains it better.