what size megafuse?
An example of similar to what you’re talking about. A little hackery of a modern (2002 Dodge Durango) battery tray with a touch of overkill for connections. AGC 2 fuse box mounted to 1/4 inch lexan and connected via a copper bus bar fed by a 100 amp fuse and a separate 8 gauge loop with 100 amp fuse from a 75 amp alternator. All non factory loads connected directly to battery and auxiliary fuse box.
An example of similar to what you’re talking about. A little hackery of a modern (2002 Dodge Durango) battery tray with a touch of overkill for connections. AGC 2 fuse box mounted to 1/4 inch lexan and connected via a copper bus bar fed by a 100 amp fuse and a separate 8 gauge loop with 100 amp fuse from a 75 amp alternator. All non factory loads connected directly to battery and auxiliary fuse box.