i tryed searching and i couldnt find anything about this, im very interested in making something like this and any help with how to do it and how to make the sub/ amp hidden would be greatly appreciated

 

just take mfd board and box out the frame for the box then cut a ring to mount the sub on then attach it all together with a screws lay some cloth over it( i forget what the cloth is called but i can find out tonight) and put on a good coating od fiberglass resin let it dry then apply some bondo over it to smooth it out paint , install and ur done. thats oneway of doing it ne way.