No one has mentioned RSL speakers
The CG23M are good speakers and you can bundle it with the 10s mkii sub which is one of the best bang for the buck subs
https://rslspeakers.com/cg3m-overview/
HSU Research CCB-8 are a good choice also they have...
corrugated plastic signboard could work too. Get it in black or white and paint or not.
Sheet metal and snips and a vice to bend and shape, could then drill and mount it.
Put an RGB led strip in there and make it a feature instead.