I have one in my drag car. Its an 8 circuit fused panel that mounts to the rollbar or flat panel. I have it mounted overhead on my halo. The wires are good quality and every wire is labeled and color coded. Its still a bit of work even though everthing is well layed out. I have never had an electrical problem in my car. The factory fuse box was so trashed, I had to patch it up, but ended up ripping it out. Saved a few pounds too.
I basically have these circuits.
Starter
Ignition
Fuel Pump
Water Pump
Fans
LineLoc
Rear parking lamps
Alternator field cut off