Sunroof leak

[NoTime4Caution]

I have a Series 1 Turbo with a sunroof that (surprise surprise) leaks. When first driving the car after it has been in the rain, a remarkable amount of water rapidly drains into cabin when braking or going up or down a hill.
I've detached the rear part of the headliner and can see evidence (i.e. rust and small leaves) of water draining from the central part of the sunroof frame, through the hole in the frame for the sunroof motor worm screw, and onto the top of the headliner. On top of the car, looking through the gap between the roof and the sunroof I can see more rust and leaves in the central part of the sunroof frame, which the Haynes manual says can collect water. It suggests running a bead of sealant on the edge of the sunroof frame to prevent water from flowing towards the middle.

So far I've only cleaned out the four drains hoses (three of which were definitely clear, with the front left one possibly having a small blockage) and confirmed that they drain well. I'm going to take the top part of the sunroof panel off to fix the small plastic box that surrounds the manual release lever (it's loose and rattles), but I expect that this won't provide any further access to the sunroof frame. I assume I'll need to remove the entire frame to try the Haynes manual's solution.

Am I missing anything? The sunroof seals themselves aren't in great condition (I'm in Australia, and the sun/heat gets to them), but I take it that they were never supposed to form a perfect seal with the roof. Would it be possible to semi-permanently seal (and therefore disable) the sunroof so that I can at least park the car in the rain, and then fix the sunroof properly when I one day have the car reupholstered and resprayed?

[Bilkob]

Just seal it up. Get it as dry as you possibly can on the inside first otherwise it’ll fester from the inside but then just carefully use silicone sealant to seal it. When you go to tackle the whole job you can knife through the sealant.