[Pajarojo]

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 🤣 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.

 

[Pajarojo]

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. 🤔

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 🤣
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.

 

[Pajarojo]

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)

 

[Pajarojo]

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)