Now that I've finally had a bit of free time to actually build one myself; A bit of an update on the dimensions if anyone else is considering doing their own - a 22" depth will fit, though it is rather close at the back of the car where the tray rests protrude out and can rub a bit towards the front at the tray/false floor pivot point (but once in, how often will the tray need to be opened anyway).
I'd also like to say thank you Phinnegan, as soon as I put the sub I've had for 17-18 years (4 cars) in the trunk I knew it wasn't going to last as it took up about a third of the trunk space and after seeing the pics of your build I knew this was what I needed -- only downside is my emotional attachment to the Polk dB10 I've had, and that it wouldn't fit without taking out the spare which I really don't want to do.
I'd also like to say thank you Phinnegan, as soon as I put the sub I've had for 17-18 years (4 cars) in the trunk I knew it wasn't going to last as it took up about a third of the trunk space and after seeing the pics of your build I knew this was what I needed -- only downside is my emotional attachment to the Polk dB10 I've had, and that it wouldn't fit without taking out the spare which I really don't want to do.