hey the books great youll find a great section on dealing with sound in yr cab
if i understand correctly your idea will cause you a muffled effect
best solution will be look at the book when it arrives and plan ahead for where the sound will travel from
speakers at front similar to those found in vewlix systems have speakers aimed at you and open, your idea to stick them behind bezel and such as said above will muffle the sound its like take a speaker and place that speaker in a box the lack of air movement creates flat muffled sound against somewhere with an open area
if you want your sound to travel at you the speakers must in turn be at the front
an idea would be use part of the marquee area and isntead of aiming the speaker down as most do aim it outwards towards you of course the speaker in any given situation is far better heard when slots holes or even the whole area is cut out for the sound to go
enjoy the book anyhow ...