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I think you may already have found this based on a previous comment but I'm going to use this 6 relay box:

Amazon.com: 12V Auto Waterproof Fuse Relay Box Block Kit [6 Bosch Style Relay Holder] [6 ATC/ATO Fuse Holder] [Relays & Fuses Included] Universal Relay Block Box for 12V Automotive Vehicles Cars Marine Boat Jeep : Automotive

Plus a rocker switch panel (there are hundreds of options, here's one):
Amazon.com: Nilight-90111F 6 Gang Aluminum Rocker Switch Panel Toggle Dash 5 Pin ON/Off Pre-Wired Rocker Switch Blue Backlit Switch for Automotive Car Marine Boat RV,2 Years Warranty : Automotive

So that's somewhat clean and straightforward and about $60 plus the cost of wire.

For controlling the relays, I'm going to get a little more fancy and use @tngw1500se's Idea to control relays with push button momentary switches and a microcontroller as discussed here: WIRING: If I had it to do over again.....

It gives you some added flexibility such as being able to control a load from different switches (e.g. a light switch by the door and the bed controls the same light) and I can also add temperature (or other sensors) to use it to control loads like battery warmers, tank heaters, etc.
The downside to this approach is obviously complexity 馃ぃ But I've often tried to wade into the world of Arduino and this gives me a practical reason to do it, and thgw1500se already wrote a lot of the code for me (it's in the thread I linked above) so that's a big head start.
 

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I hadn't searched for a fuse/relay box /without/ switches. That looks super good as well. Then I could just more attractive buttons, as you suggest. Okay... liking that. 馃

The current contender is this thing: https://www.amazon.com/dp/B08J6W4TJG/
That's pretty cool! I'd probably be going that route had I not seen tngw1500se's post. Since then I decided that I wanted to be able to turn on the back/side spotlights from a switch next to that door and from the driver's seat... and then I started down the "what if I added temp. sensors and had it control my tank heaters too?" road and it's snowballed a bit from there 馃ぃ
I'll have a write up of my experiences in a month or two. I've got a simple Arduino setup currently working with some push buttons switching a 16-channel relay board on/off but the temp sensors will add another layer of complexity to that. I like the little round metal buttons that I linked here as I can just drill a hole and install them in the dash or headliner or a custom panel, but the labelling will be a little tricky to pull of nicely, especially compared to the switch panel you posted.
 

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I'm finding that the hardest thing with these arduino projects (once somebody else does most of the legwork and posts a video for you) is just figuring out how to package it and get it installed permanently. So the cables, the cases, etc are what are really the challenge (so far)
 

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I used a pistol case. They're plastic with latches and make a little "cabinet" when mounted on the wall. Since they're plastic, you don't have to worry about a wire shorting to the box either. It would be easy to get a fuse box, relay board and a esp board in the case. I just cut a thin piece of plywood to fit inside to mount everything to. Sometimes you can find a buddy who has one for free. I also mounted a LED in mine on a switch so it lights up inside.
Nice idea. What do you do for cables? I bought a kit with crimpers to make my own cables with dupont connectors but it's pretty difficult to get good results with that. I think I may end up with something like this (not sure if this is the right one for my ESP32 board but something similar)
 
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