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The sun roof isn't exactly designed to leak but it is expected to leak - take a look at the brush-like seals on the sides. Only the front and back parts of the sunroof have rubber seals. The brush-like seals are (obviously?) there to allow for a sliding motion that a rubber seal would find hard to accommodate.
In the W123 the sun roof drains run down inside the front screen pillars - does your van have the same sort of hollow pillar design?
The rear drains could be guided down another section (if there is one) and directed out of the cabin under the car.
Ideally you need to find four decent routes from the roof to the underside of the vehicle - rather than tie-wrapping tubes to the interior trim...
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