Big gauge power wire to battery...

howdy, y'all. here's my dilemma:

i want a clean way to mount my 4 gauge power wire to the battery. i have a gold-plated distro terminal that i can use, but i want something cleaner. i have a '95 integmo gs-r... and i was peeking at the fuse/power distribution block in the engine compartment near the firewall on the passenger side... and i wonder if i can hook something up to that from underneath... to the spot labeled as "50A - OPTION"

does anyone have any experience with this? pretty pretty please?