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.