If you look at the midbass driver's build and form, you will see that it has been correctly mounted in this design. Some drivers are designed to be flush mounted, others for surface mounting. A close look at the driver photos on diyaudiocart will make this matter clearer.Looks beautiful but I'm worried about the fact that the woofer is not flush mounted on the baffle. This may lead to high frequency diffraction effects at the edges of the woofer. It won't be as bad as diffraction due to the tweeter not being flush mounted but when so much care was taken for everything else, why not do this basic tweak.