So, after two weekend afternoons on the new-to-me ‘McKenzie’ (NA):
centre console out, vents out, tombstone out, old radio (Sony single DIN) out, swap cubby box to top slot, put 2 3" speakers in each headrests of driver and passenger seats after removing the one in each that was rattling around before, drop wiring down back of seats, crimp and solder connectors on, wire it up via central tunnel, reversing camera (not necessary but why not) on underneath boot lid, reverse signal from rear reversing light, all routed via centre to front, wire up speakers, remove A pillar trim and fit DAB+ aerial, refit A trim, fix GPS receiver up near vents, connect all, test, reassemble. Oh, and removed the buzzer relay that NA Eunos’s have which is annoying.
So now I have a single din head unit with removable front plate, so when off looks like nothing worth nicking is there, but when attached and started, screen flips out (missing gear lever and handbrake, and not obscuring HVAC controls) and gives double DIN sized screen for DAB+, radio, bluetooth (streaming music and phone), SD card playback, CD playback and CarPlay. All in all a cost effective and sensible solution for a soft top that will be left hood down most of the time. Gives a lightning connector in the central box and a USB port in the glove box too.
Sounds are much better. Waiting for the replacement door speakers cos the current ones look knackered and one doesn’t work - and then it’ll be sorted…
Do note that the telling of this is coherent and step by step, whereas the actuality had a few “whoops forgot that” bits, and a few more partial builds to check connections. And the odd pause for rain, cups of tea, etc. But nothing too difficult, just had to be patient and logical.