Ramen Sama

Hello. I'm the new owner of a 93 RX7, first time with the 93. Anyhow. Got the car as a roller, so it's missing some stuff. Firstly, it's missing the Battery connections. No ground cable and no Main Fuse Block. I see where the main fuse block connects, but i don't have enough wires for all the spots on the Fuse block. Where will i run the Main 120 amp wires to?

Also, on the other fuse box by the Strut tower, Power needs to go to the nut under the cover i have marked.

I Hope this makes sense, i've been looking thru the wiringing diagrams and it looks like power comes straight from the batter to the 2nd fuse box. Please provide pictures if you can.