Solid construction - 18mm as per instructions, got 2 short-of round holes already drilled out by my bro-in-law. Shocking, as they're not round, and he's the director for a building company!!!
Still, it's pre-dilled for 10cm speakers, but you could easily re-do it for 6x9's.
If anyone wants it, it's free, but I can't be fudged to post it...
Can take it to Yaris meet if you want it. Just buy me a Pepsi-Max or summit...