you can use my dimensions - they are the inner dimensions. i used 12mm MDF which i know is thin for a woofer box but you really sacrifice box volume with thicker MDF. Using 12mm does require some precision when using screws as it splits easily.
It is the biggest sealed enclosure you can fit in there. In the end, i had to cut a slight slope into the box to allow a perfect fit with the lid attached.
If you decide to drop the box part into the cavity, then screw the lid on inside the vehicle rather than assembling the entire thing outside of the car you might not need to cut the slop but it will be annoying to hold the box up perfectly level and screw the lid on perfectly.
The reason for the slope and the direction of the slope will become apparent when you have a look at the cavity - it's not a straight up and down affair.
Do you have Bose audio? If so, the amp will need to be relocated.
Also, i am running a single Kenwood 8" woofer. The only way i can see dual 8's fitted is if the OP built a free air setup - ie, just what you see in his pictures and nothing underneath. You won't fit dual 8's in my box. In fact, the width of the box barely fits the woofer!
For the lid, use your boot mat as a template then jigsaw it out as a starting point. You'll most likely need to do a few trial and error fitments and trimmings before achieving a perfect, snug fit. Goodluck!
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