Radio Install in Canyon Cat 17qbc

[whitmw]

My little canyon cat did not come with a radio installed. The antenna for one is on the roof and there are 2 stickers on the inside ceiling that say install speaker here. I believe the wiring has been installed but not the equipment. I would like to install one with speakers but I am a little unsure about cutting into the ceiling. Also seeing pictures of other trailers like this one, there is 3 wooden panels in a cabinet. The center panel is gone and a radio is installed. I guess what I am asking is how do I cut the wholes in the ceiling for the speakers and how do I remove the wooden panel to install the radio. Just a note, the area to access the the back of the wooden panels is closed in and no access is available.