[Al Skierkiewicz]

Neil,
The block that Andrew references is similar to the type used on FRC robots prior to the PD. It uses the same breaker size as the 30, 20 amp breakers that are legal on FRC robots. What is better is that the power distro inside the block is sufficient to keep losses at a minimum. The terminal block wired as you show, drops voltage across each wire and connection from left to right in your photo. You can help things if you move the input to the center of the terminal strip instead of the end. That splits the load equally.
I really recommend another breaker or fuse near to the battery. It should be sized such that a dead short on the battery would trip the fuse/breaker before the battery is damaged. The limit on the battery you reference is the current that the terminals can handle. I would shoot for 100 amps max. Anything more than that is likely to cause the terminals to fail.