You're not going to fit the hardware you have into a doubleDIN slot. The microATX motherboard itself is too big. You'd need mircoATX or smaller formfactor.
One thing to consider is that the tight fit of all the components creates a potential issue with EMI (electromagnetic interference, aka "noise") in the audio and/or video. If you do run into this issue, it becomes more difficult to track down with everything packed in so tightly.
Also, cooling is another element you need to consider, especially with all that hardware jammed into a small space.
As far as cases, your best bet is fabricating one yourself. ByByte has a DD case designed for nanoITX motherboards. You might be able to use that as a starting point, but there would still be a good deal of fabrication, for which you're on your own.
One good way to make your install stealthy is to have a stock stereo faceplate that you can put on to cover the screen.
Making the screen removable will likely be troublesome.
Good luck to you!