Love the thought you put into this, cardboard mock-ups and all
I can't wait to see what it looks like when it's in

I really like your cardboard mock-ups
I'm glad you both like the planning. It was my project for the Christmas break but as you'll see I may not have planned as well as I
could've done.
Episode 2 - The Midlands Dashboard Masacre.
I've finally got some photos together so I can start posting them and putting this story together.
First job when I get the new unit is to figure out how to mount it. You don't get a mounting cage with it so I initially looked at using a universal cage with the side locking arms. It quickly became apparent that this unit isn't designed to fit a 1DIN cage and is actually supposed to fit to pre-made brackets for your specific car, sold separately.
First problem: The unit doesn't sit in the cage properly as the back of the screen sits back further than the proposed front edge of the cage - where the metal case ends in the photo from the last post. I didn't want to mount the whole thing any further forward at the time but with hindsight that may have been a mistake. I had to trim the cage to fit around the screen, not really a big deal using aviation snips and some files.
Second problem: The unit has nothing to pick up the little locking arms on the cage. Well shit, this stumped me for a while. There are recesses in the cast casing of the unit so I cut down the arms to fit, it kind of worked but I wasn't happy. It was either impossible to remove the unit or too easy, depending on the wind direction, what I had for lunch and the alignment of the stars. The whole thing was wobbly anyway because those universal cages aren't designed for anything heavy so I ditched it and went back to the cage that the factory radio fitted to.
This cage was plain but it did fit very solidly with two big sprung plates to clip behind the dashboard aperture. With the head unit in place it supported it much better. There was only one option for mounting, I had to do as Alpine intended and use screws, through the plain sides of the cage and into the sides of the radio, picking up the proper mounting holes. That's right - the radio is
permanently fixed to the dashboard. I'm not going to go through all of the steps that are now required to remove it but it involves taking out lots of screws, the entire centre piece of the dash and then removing more parts to get access to the screws with a screwdriver. Should deter anyone trying to steal it. Even a saw wouldn't get it out easily. Two screws on each side of the head unit keep the angle fixed so it can't tilt within the cage. It sort of works.
Now, from my first photo with the cardboard 'scale' head unit you can see that I intended to mount it as low as possible, reducing the amount of screen sticking up out of the dash. This wasn't possible as there's a big metal bracket inside the dash that is a mounting point for the dash itself and acted as rear support for the factory radio. Removal would be destructive as it's permanently fixed in place and I would also lose two dash fixing points. I had to stick with the 'normal' mounting point, which is probably better for viewing the screen but it does sit further up that I would've liked.
I still wasn't finished with the mounting. Sliding it in at this point would just be met with a thud as the back of the screen hits the top rail of the plastic dash. No problem, out with the saw. This is one of the few original parts of Bugsy that I don't mind cutting up, it's a standard part that I could easily find on the bay of E. This is how much I had to cut out to get the thing to sit back into the dash:
This is clearly quite fugly, so over to the 3D printer to make a cover. More pissing around getting the angle right to follow the curve of the dash and this is the result:
Magnets hold the cover on as the back panel of the screen is steel. The magnets don't seem to affect the operation of the unit.
The thing was then sanded and painted, eventually with satin black paint after the Tamiya paint I tried just didn't work out too well. I wanted a colour match with the dark grey plastic but since the head unit and trim ring is black anyway I gave up. It isn't perfect but good enough for now.
Notice how I'm slowly revealing it. That's enough for now, the next episode will deal with the wiring.
