It looks like he has repaired / replaced a few things.
My thoughts are that the sliding doors are from a Viano.
No phone cradle is an advantage as if you upgrade to Android that is BT and the cradle is redundant and the additional page for it on the dash menu isn't present.
But as BTB' check all functions correctly with the steering controls, if it's a DIY upgrade he may not have wired through the spiral and coded to the van.
The steering wheel looks like a repair / upgrade. No problem mine has been, but it might indicate high mileage. MOT history is good for looking for discrepancies. It's easy to pay low mileage prices for high mileage Vi's.
Check any UK vehicle to see if it has been stolen, written off, scrapped, exported, has outstanding finance or log books loans, plate changes or colour changes
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The 'velvet' rear lining looks like a good job, but look for saggy bits. I've learned on my boat that sometimes the glue doesn't take.
I have reasons but for me it's gotta' be a tailgate and not the barn doors.
The parking sensors are original, and for the fronts that's a must. Even if faulty at least a repair to oem spec is possible. But as BTB, with ignition on get someone to walk across them while stationary, they initiate below 10KM/hr (I think is the figure).
Tbh I would have serious concerns with a van that has been messed with so much. Hidden Gremlins become more likely, but I've done a fair few things to mine and don't consider it has those hidden Gremlins.
'But' any new owner does have issues of understanding my installations, even if I do drawings of them as I go. An independent Merc specialist isn't going to enjoy fault finding on any non standard stuff, in the event.
If the seller will provide the VIN you can interrogate what was installed at manufacture. That can be very useful, for no valid reason though many sellers won't provide it.
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Here you could check for the Comand, steering controls, even the diff ratio.
Another point I forgot to mention. The 'Long' version will go on most ramps, where the 'Extra Long' won't. I had my earlier Viano rejected by a few and that left me looking for a commercial repairer that could accommodate.
As an aside, BTB you have the auto lights. does that mean you also have the auto wipers? Is that then a reasonable assumption that auto light also means auto wipers when I'm looking for my replacement?
That is an extra I'm keen for.