I have a '98 Cali, never left Germany till I bought it.
Yours looks excellent, I'd be delighted to have such blemish-free metal! But I suspect it's a combination of 2 vehicles - a genuine Westi perhaps with rust or crash damage, and a low mileage good quality donor. Whether the donor was used to provide complete panels, or whether the insides of the westi were stripped out and put into a another vehicle is hard to say from the photos alone.
The furniture is the real deal, though the coloured strips are unfamiliar - maybe that is just the age - my strips are varnished wood. The roof is identical to mine. The back left panel rather than glass is troubling, though glass is utterly pointless in that position anyway. Mine has 2 black plastic chunky vents, on the floor at the step into the cab, one for recirculating the hot air or aircon into the habitation, and one (unused in my case) for the optional diesel heater located under the chassis more or less under the sink unit. I would have expected to see the iconic "Caktus" design on the seat fabric - but, again, that might be different in your year. That second mains socket in the centre of the van is not original I'd say.
OK - one big red flag - look at the window at the kitchen unit. In mine it's a push out type, with little arms at each end - and goes out to about 180 degrees. It's made of plastic, double glazed, kinds bubble out a bit like caravan windows. Comes with a warning to close it before moving off. On yours, it looks like the one on the sliding door, glass, with a sliding section and built-in flynet. Again it could be just the year but I'd suspect a donor.
All in all that's a classy looking Cali. I'd be proud to own it. But it might not satisfy the guys who gather in muddy fields to evaluate each other's vans for historical accuracy.
My 2¢!