I got a mini bluetooth speaker kit from Amazon and didn't want to use the included wood pieces, so I made up this little thing. It all ended up snapping together nicely with no glue needed.

I might end up adding a cover piece for the back/battery holder in the near-ish future, but I'm happy with the way it is for now. 

About the Insides:

I designed the model around the components of this particular kit. However, if you compare the photos of the board on the product with the one I actually received, you'll notice mine has a separate connector for the switch. Not a big deal, I just wanted to point that out.

If you're looking to buy things separately -

• Boards
  • This is the board originally pictured in the kit's product page. 
  • This one will work fine as well and only has a single speaker input.
• Speakers
  •  2" 4Ohm 3w with four mounting holes like these (Amazon) or these (AliExpress).
• Switches
  • The cutout in the model is 9.15x13.7mm, meant for 10x15mm two-pole switch like this (AliExpress) or this (Amazon).
• Battery Holder
  • 4 AA Holder with mounting holes, like this (AliExpress), or this (Amazon).
• Other Stuff 
  • Cables / JST connectors/ solder / etc