Technical Does the fuse box need to be inside the cabin? Building my '49 F-47

Here’s mine in a Model A. Mount the box high but not too high to get to the bottom where the fuses are

 

You've got some really good suggestions so far. I'll throw my opinion out for the passenger side kick panel location. This is what works for me and my particular car. Have a couple of reasons why. I just sit down on the door sill plate, lean over and have access without negotiating the steering wheel column and pedals. If I'm pulled over for an issue, I'm always out of traffic on the passenger side. My Odyssey Battery hangs on a brace in front of the firewall about 10 inches from the fuse panel, so I have everything in one place. Again, just what I like and one more option of many.

 

Exactly ^^^^^^

 

I very rarely have the need to access the fuse panel so I don’t worry as much about location. The Fargo has it way up under the dash on the left side. If fuses are blowing somewhat regularly then fix the wiring. I honestly can’t remember the last time I had to change a fuse.

 

My experience says that the only time you need to access a fuse panel is in the dark, on the side of a narrow road in the rain.
A number of years back a buddy set his up on what I can best describe as a drop down drawer with slides. He released a latch, it dropped down a few inches and then slid out in the open under the left side of the dash where all the fuses, relays and flashers were well marked and easy to reach. He said he had to have enough extra wire so it would slide out that way.
The older I get the less I want to jamb myself up under the dash to get to a hidden from sight fuse block., The firewall mounted one sounds pretty good. A guy could even build a recessed box to put the fuses and relays in with a cover that blended in with the firewall that you removed.