Some Pointers for a sub box.

[TigerTony]

Hey Everyone! I'm going to build a Single Chamber Box for two DC level 3's which is my plan so far for the next subs i am getting.

For Bracing, I've heard about Wooden Dowels, Where can i get dowels to to Brace it. And if i didn't plan on Carpeting the box( i can if i have to but I don't think i need to) what kind of wood would I use?

Here is what the dimensions will be.

And in Case i decide to only put one Level 3, here would be my dimensions.

Would I also need Bracing for the single box and would it be the same as the box for two?

If anything is wrong with either of the the dimensions please let me know.