Need help wiring switch panel for boat

Whoever made that should have put a distribution panel on there I think.

Like Other said, I would put a DC sub panel.

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shouldnt the negative ground go back to the batteries negative terminal?

Do your switches have 3 terminals? Do they light up? Might make things a little trickier

What is wrong with the cupholder?

This is my brothers rig Im just trying to help him get it wired.

With a ground terminal bar and 2 wires to each switch, would you just run an inline fuse on each positive

No, I figured you'd listen to others. I'm no boat mechanic and have only help fix crap.
You'll need a 2 wire feed from the battery to a fuse bar which usually has a ground bar of sorts too. You'll need to run power to all switched or unswitched devices. This is where I differ from what I have seen. They tap off a ground from any close grounded wire, I've located and fixed too many like that.
The cup holder will make you want to throw your tools in the water after trying to work around it while cramped and on you back with no light.(unless it's removable)

Agree with Chris4x4 no need for a bunch of fuses. One fuse off of battery on hot side and jump that hot to all the switches ending at the cig plug. Ground them all common nack to the battery. Less wires. Less trouble shooting in the future and your still protecting everything. Easier now the easier it will be later.

Panel made by a small fab shop in Arkansas. Cant remember the name or location.

Ok so run a wire from battery to switch panel, fuse it, jump that across each switch to the cig lighter?

Then explain the grounding setup a little more in detail please

No this is for a 1648 Tracker Grizzly used in Northwest Arkansas (Beaver Lake, White River, etc.)

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Ok so run a wire from battery to switch panel, fuse it, jump that across each switch to the cig lighter? Then explain the grounding setup a little more in detail please

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run a positive wire with a fuse from the battery to the cig lighter. At the terminal that attaches to the back of the cig lighter, make a pigtail with an additional wire coming out. This will also be a fused positive (because it is a continuation of the original wire - don't need to add another fuse). Connect that wire from the pigtail to the closest switch at (+) input. Repeat the pigtail just like you did at the back of the cig lighter and jump to the next switches (+) input. Repeat for all switches.

For Negative - I am assuming all of the switches are lighted 2 way switches and have three terminals on the back (+) Input, (+) Out, and Negative. Its hard to tell in the photo looking from my phone.

You repeat what you did for the positive, except you may have a better (closer ) ground that running it all the way back to the battery. If you are close to the helm, there should be a Ground distribution bar under the helm. You can just run your main ground wire to that bus rather than back to the battery.

It doesn't need anything complicated. Just use one fuse on the main positive coming in, split it over to the switches one by one and do the same with the ground.