Trunk mounted battery

I had my engine bay painted, looks so nice I want to move my battery to the trunk. Can I just run a positive cable inside my car to my starter and run a cable from the starter to relay and run a ground to the frame of the car? I was thinking of adding a cut off switch near the battery for security protection when the car is parked. I just want clean up the engine bay, I'm not running the car down the race track. I am using a Optima Battery with a hold down battery tray.