I wonder if I removed all of the brackets and black surrounding plastic housing would the player be slim enough to slip or hook and loop under the passenger seat; if I kept the wires connected or extended the wires? Maybe even extend the wires so that it could reach the upper shelf in the glove box and hook and loop it with Velcro. If it's not black on the sides maybe just spray paint the metal black or maybe even plasti dip. Who am I fooling, I can't remember the last time I played a CD in any of my vehicles. Well I'll see.
Oh and by the way an excellent write up and great pictures. Thank you very much.