Yeah, that'll work if you can get it to fit. I'm sure all the forums have their own projects but I know that f150.net has a few good ideas and projects that people have done.
Here is an older picture of my setup.
The only speaker you cant see is the 4x10 speaker on the other side of the amps. The speaker amp is below the subwoofer deck.
And I built everything sturdy so I didn't have to worry about not being able to set stuff on it. The speakers are sunk lower than the amp so anything that sits there does not put enough weight on the speakers to break them.