Thank you both.
Originally Posted by focusboy5
You NEED to do something with that sub box....Not trying to be rude, just helping but the correct wood for a sub box would be 1/2" - 3/4" MDF. And throw on some carpet to cover the wood or spray it black even.
3/4" MDF is almost the best wood to make a box out of but 3/4" Birch board (what I used in the end) is actually better. As for carpeting or quick spraying it black, I'd rather do it once and do it right. The reason it's taking so long to get the sub trimmed in is because the whole inside of the car is being built around the box so only one section can be done at a time. I expect it will take all winter before the whole thing is done but with the amount of work I'm putting into this when I have time, I'd rather take slow and plan it carefully than rush through it all.