You guys are going to have to contact Tony as he is the one who made them but, as the owner I can attest to their awesomeness and he did a phenomenal job.
The crossovers are all mounted inside the fiberglass enclosure. If you need to get to the crossovers then you just unscrew one of the speakers from the enclosure but, I have not had any need to do so as they were installed and adjusted correctly from the get go.
I have a tuffy center console and the amp was mounted below the box, on the floorboard but, hidden by the tuffy. It is very trick and the tuffy was mounted on 2 inch risers to allow for clearance and air flow and the amp was also mounted on rubber grommets just in case water was to run down the floors it wouldnt touch the wiring and short out the amp.
I am also carpet less.