Your cabin shouldn't be wet, mdf "should" be fine.. Humidity isn't an issue with mdf. Actual water is though.

That said, plastic cutting boards at Walmart. We use them on boats because they're cheap hdpe plates. Not as easy to "build" with compared to mdf IMO, but great for Amp boards. A couple of pieces of abs or pvc pipe for risers and you can build an amp rack pretty easy.

 

Mdf will work usually if you coat it in a outdoor stain/ sealer typical used for decks should last year's I doubt it's getting blasted with rocks?...

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well, since I'm not going out to any stores due to the pandemic, I did find this:

King StarBoard Marine Board HDPE Sheets and Custom Cut : TAP Plastics

Looking for the toughest thermoplastic to use in marine applications? Look no further than King Starboard and our assortment of cut-to-size HDPE sheets today.

www.tapplastics.com

cut to exact size for not much $$$

 

Nice Find! Gonna have to pick me up a couple sheets of it.

 

Why not use 1/8” aluminum plate which is also thick enough to drill/tap M4 fasteners into? Speedy metals will even cut it to dimension for you.

 

Carbon fiber sheet/plate.
Cheap if you buy wholesale from the manufacturers in china using Alibaba and still not obscenely expensive anymore if bought stateside from a mass production company.
It is stronger than steel, lighter than aluminium, water is not an issue at all, you can cut it, drill through it, install nutserts in it, use epoxy to attach things to it, etc... And it looks good. I use genuine 3M carbon plate all the time for racks, trim pieces, panels. It's awesome stuff. I made this panel in about 10 mins the other day for a customers car.

 

Carbon fiber sheet/plate.
Cheap if you buy wholesale from the manufacturers in china using Alibaba and still not obscenely expensive anymore if bought stateside from a mass production company.
It is stronger than steel, lighter than aluminium, water is not an issue at all, you can cut it, drill through it, install nutserts in it, use epoxy to attach things to it, etc... And it looks good. I use genuine 3M carbon plate all the time for racks, trim pieces, panels. It's awesome stuff. I made this panel in about 10 mins the other day for a customers car.

View attachment 284985 View attachment 284988
View attachment 284989

So what does a piece around 16" x 48" go for on that scale? I am not looking for a container full from Alibaba, several sheets this size a year would be more than enough. With that said, I have not found any company offering the stuff at a price point that makes it a realistic possibility.

 

MDF will warp from heat. The hump in my truck definitely gets hot enough to warp. My car doesn't get warm so just something to think about if you go that route.

 

The "phenolic type" of board for house wiring panels is pretty expensive, but 1/4" and insulated to maybe 480v... I got an offcut, and use it when required.

It is not phenolic per 'se, but some fibreglass based composite.

 

And that's for like. 36" by 36" plate a 1/4" thick

 

Looks like Lowes has a higher mark up and it is not even solid Carbon Fiber

 

wow :|