MJH, It sounds like you are building something very similar to what I have done. I too went with a false wall and the in-cabinet speakers. I started a post about my project here, it has some pics as well: http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showflat&Number=379638#Post379638

I have not heard all the in-cabinet speakers at once yet, but can say that after listening to each one individually, they sound riveting. Let me know if you have any questions I may be able to help you with.