That seems like an odd choice of head unit, but perhaps you never play any form of disc?
To have a single DIN HU fit in the cup holder/ashtray it would have to be very shallow, and thus have no disc drive.
you could also lose the cup holder, do you ever use that?
I might be missing the point of your location choice, but a double DIN head unit in the factory position could easily be a touch screen, so would work as your reversing cam screen as well as all the other features.
It's an old school '80s radio, about 1/2-2/3" depth of a typical radio and it has a separate tape deck which I can hook it up to the radio or not (I still have a few tapes left in a box - those homemade mix tapes). I might have to move a control box underneath the ash tray though - not sure what it is for, I'll have to do some research.
I currently have 6000CD and also have a spare 6006E (which seems to have the well known 6th disc issue) but I mostly listen to the radio or mp3s off USB (I bought one off Ali, it works well once all the files are in place but getting the files in the USB can be tricky). I think I can add aux. input to the old school headunit without too much trouble so that's no big deal.
As the factory setup leaves much to be desired in my opinion, especially with pre-facelift 6000/6006, I don't think I'm losing much.
As for the location, I found I quite liked having a radio there having owned Citroen CX & GSA for a few years.
I don't drink in the car, other than water in a sealed bottle (which is usually too big to sit in the cupholder anyway). I have been thinking about designing a "proper" cup/water bottle holder. I'd rather not have a cupholder that is an accident waiting to happen.
I forgot to ask, what Ideas do you have for a cup holder?
Ive been thinking I might need to make one in the future if I block access to the cup holder/ashtray trim.
I haven’t come up with any designs yet, but would need it to work even if there was a passenger in the front.