Building this subwoofer is actually a lot easier than my instructions might sound and can be done in a day with very little effort. I'm just trying to give as much detail as I can so you should read through all of this prior to starting. The kit itself will go together okay even if you have some slight assembly errors with bracing or side panels not being 100% squared up. That's always a goal for my flat pack designs. If you see any mistakes in my instructions, please let me know. The rear panel has all the letters carved into the back so you can see where all of the inner panels go. They're hard to see in the first picture because of the lighting.