distribution block for cap. or not?

well i would have a fuse somwhere close to the amp incase of any melt down problems . also have a curcit breaker or  real big fuse in the front of the vehicle . MECP installer,technician

No distro is needed because the power is a direct line to one amp.  The cap is wired parallel in that power line just before the amp.  Use a short length of visible wire between the cap and the amp and you can leave that small section unfused if the cap is directly next to the amp.  If that section of wire is partially hidden, contacts the chassis, or the cap is away from the amp, fuse the wire to its capacity (same as the main fuse).  This is a continuation of the main power wire, so it is the same gauge as the main power wire, and same gauge as the ground.  Ground the cap to chassis to a point near the ground point of the amp, although some schools of thought say to ground cap to amp, then ground amp to chassis. Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Thank you for your thorough advice, answered everything