If not, you can use online laser cutting service such as Outfab and cut it out for under a hundred bucks.
You can use old speakers for the components like I did, or purchase the speakers and amplifier from your local electronics store.
An old stereo system should have everything you need.
Step 1: Harvest Parts
After taking the old speakers apart, analyze them and trace where the power and audio signals go. You'll need to know what to connect where.
Step 2: Design and Laser-cut
Step 3: Parts
For fastening the plywood I used 1/4" square nuts and 6/32 3/4" Torx screws.
I also sanded the wood to make it smooth but also so it fits in the slots.
By design, all slots were made smaller than the thickness of the plywood, so that everything can fit well after sanding.
Step 4: Assembly
I also put some hot glue on power and audio cable inside in order to prevent them from being ripped out.
Step 5: Done
You can stain it or finish it in order to match with your decor.
You might be wondering why I put those rectangles at the top - they serve two purposes: one is to keep people from blocking the vent holes at the top with flat objects, and the other one is to make the speakers stackable (I should have put some on the front and back too).
You can also put a honeycomb or other patters in front of the speakers if you wish to keep them hidden. You could also use some thin polyester fabric and stretch is between the plywood and the speakers.