I made a smart mirror for my girlfriend and it has an LED strip for accent lighting, with an Arduino controlling it. I've got a pot to control the brightness and an encoder to control the colors, so now I wanted to make a simple panel to mount on the side of the mirror frame for the knobs to hang off of because the wood is too thick to mount them directly without counterboring the hole, and I'm not set up to do that.
I don't know if I'm just not Googling the right phrases, but I cannot find a small (2x4") black, blank panel made of metal or plastic for this. I can find larger metal panels, but the only metal-working tool I have access to right now is a drill. I bought a couple blank outlet covers from Home Depot but they cracked every time I tried to drill a hole. I only need one panel so I think a custom designed panel would be prohibitively expensive.
Several ideas come to mind.
Use thin hobby plywood for the front panel.
This is the plywood used to make dollhouses, RC wood airplane models, RC boats, etc.
That would be my first choice.
hobby plywood sheet
Use thin hobby plastic sheet for the front panel
This again is used to make dollhouses, etc.
This would be my last choice.
Hobby Craft UK
I have used this in the past.
It is normally used to patch automobile rust.
fiberglass fabric and auto body putty.
cut the fiberglass fabric to the size you need.
gently spread the auto body putty across the fiberglass and smooth as well as you can.
Let the auto body putty dry.
sand so it is as smooth as you need.
you can provide the holes you need.
paint as you like.
there are also epoxy kits, but i have not used these.
The advantage of the fiberglass fabric is that you can shape the fabric into simple shapes
a friend has tried this and says it works great.
Make you own Sugru
if you decide not to make your own search for "sugru moldable glue".
In my opinion it tends to be expensive.
The Make Your Own Sugru may be the way to go.
You could embed the encoder and pot in the sugru substitute.
Those are my suggestions.