Sounds like you've put a lot of thought into this, but I can't really figure out what your question is!
I know things are a bit tough in mexico.. You may want to consider making your lcd detachable. Theres a few diferent ways you can go about this.. It all depends on what hardware you settle with.
My original design was going to be for a single din player with a detachable face... I may be making a double din player now though which would be a bit large to make a detachable face for.