I have had trouble getting responses on the same question, but I thought I would offer what I have found. I will assume you want to mount your screen in the dash. Maybe if we pool our knowledge we can help each other out.
I have a 99 Chevy Tahoe. The stock radio is a 1.5 din, with the A/C controller located just below it. Below the A/C control is the stock CD player (a seperate unit). These three items sit in the space I want to use for my screen. See the attached pic.
First off there are a few other choices I thought about before deciding I wanted it actually 'in' the dash. One is to order one of the motorized units from digitialww. These are basically a standard radio (1 din) sized box that Armen (owns digitalww) has modified to hold the screen horizontally when not in use. When you power the unit on, a motor ejects the screen. See this link, in particular the pic at the top:
Another way is to use the swivel basemount; screw it down to a surface and you are done.
Those are the easy ways to get by. But I had visions of my dog trying to use the screen as a step (we travel occasionally on long trips) so I had to ditch 'em and mount it 'in' the dash.
The screen itself is taller than the 1.5 din radio opening, and narrower. So I realized that I must move the the A/C controller down to where the stock cd player is to open up the height, and somehow fill in the sides of the opening with something to make it look stock.
Without going into detail about what will have to happen behind the dash, I have determined that I will have to most likely move the 4x4 switch (to the left of the cd player) to a new home (hoping this is electronic, so I can move it to a smaller set of switches instead), remove the stock CD player completely, and move the AC control into that left over opening.
That will give me the factory radio opening as well as the opening below it to mount the screen.
I will have to next cut off the divider (in pic, the one that divides the radio from the AC control) and probably toss it out. I will then use wood to make a basic frame around the sides and bottom of the screen and place it in that opening. Lastly I will have to shape this frame, with the intent to make it look factory (see in pic how the dash bezel has curves on the corner instead of a straight 90 degree corner) and blend it with the remaining pieces.
I will probably then coat the whole dash with bondo or something similar so there are no lines showing. This will leave the dash smooth, with my wooden screen bezel hopefully looking factory.
Last step is to apply some texture paint to the now bondo'ed dash to match the rest of the plastic around the car, and paint or dye it to match.
Hopefully this gives you some ideas... I would really appreciate any you might have to offer as well since I really hardly know what I am doing.