You are going to get tired of hearing from me but I just got a fair idea

I was going to pay the local installer to "Tub" in a monitor from 300 to 400 bucks but I got an Idea or two ideas to be correct Need input from someone with a lilliput

1. After looking at this photo ( sorry for stealing it off does the ridge on the back go all the way around ?? if so I could cover up the double Din hole with a flat panel then just cut a hole that the lilliput would snuggly fit into ??

2. If not I could do the above but only if I can find a "Head rest mounting pocket for a lilliput.

what do you think ?