I'd really like to have android auto in the pickup too. But it has the stock toyota radio in it that would be nice to preserve. The sanyo unit below it obviously is not meant to be there. Maybe one of those flip screen units could go in place of the lower unit.
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Early days yet.
With the Sanyo stuck in there, and the obviously re-upholstered dash, I wouldn't worry about preserving that Toyota AM/FM. Just pull it all and get the deck of your choice. You're gonna need new speakers too I'd imagine.
The seat covers aren't stock. Quite likely they are custom covers made in the industrial and "permanently" installed over the original seats. Exactly like how @c2dfj45 seats were covered in his Troopy... and how mine have been covered I might. =)
Fresh paint on a 500,000+km truck that has 4 broken wheel studs (and that's just a quick thing you've spotted)... this truck is likely hiding many signs of age. I don't mean this to discourage you; not at all! I'm just saying you should expect that the nice lipstick (new paint job) is hiding a lot of things they didn't bother to fix/repair/replace. You have documentation that it was used in a farm/agricultural setting in the Middle East. Keep realistic expectations about what you've got and you'll be fine.
I'm still jealous.