you need a high amp fuse or circuit breaker on the pos as close to the battery as possible. your fuse location does not protect against shorts along the length of the cable through the chassis
additionally, if any of you are not using a sealed battery, add a liner along the edge of the box lid to make it air tight. drill a hole in the box and add a plastic hose, with some sealant around the hose, and run it to some place where the box can vent outside the car.
most racing tech inspection will require a metal battery tie down, so add that in too. use nuts with the integrated liner to make sure the holes you drill through the chassis/battery box for the tie down are airtight as well.
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