rivets and under chassis aluminum

[NectarNick]

I am just starting my build. I am beginning by putting on the under chassis aluminum. The under battery tray was more straight forward, but the square piece is not as clear. Any tips on lining it up, or should I just make sure to cover the holes on the front and back of the chassis? I just dont want to rivet it on and be blocking some hole I need to use later. Second question; the kit comes with 1/4" and 1/2" rivets are there any instructions or tips on which size to use where?

[FFRSpec72]

I am just starting my build. I am beginning by putting on the under chassis aluminum. The under battery tray was more straight forward, but the square piece is not as clear. Any tips on lining it up, or should I just make sure to cover the holes on the front and back of the chassis? I just dont want to rivet it on and be blocking some hole I need to use later. Second question; the kit comes with 1/4" and 1/2" rivets are there any instructions or tips on which size to use where?

Might want to wait on the under the car aluminum and work on the firewall and side aluminum around the suspension so you can figure out where the brake likes and water lines will go. Most of the aluminum will use the 1/8" rivets