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I assume the water is coming in somewhere under the round dome ring. Are you not able to define the ingress point ?
I have done some marine work in the past and we used a stuff called Everdure for sealing\hardening wood. It is a 2 pot mixture which we would at first dilute with turps 3:1 Turps\Everdure so it was very dilute. Paint it on over the affected area and let it soak in and harden, then next coat at 1:1 Turps\Everdure, final coat is straight Everdure. When diluted it would penetrate solid wood or fine cracks then harden and seal permanently. You could paint it on rotten timber and after the third application it was like concrete and could be drilled and tapped. Essentially a low viscosity epoxy that could penetrate like CRC. It would find any crack or even quite solid material and turn it into rock.
Another idea. If you can't seal under the dome ring how about adding an 'apron' to the bottom of the dome that overhangs the roof by a wee bit when parked ?
You seem to have clearance for it to be 'misaligned' when the dome has been rotated and at 25cm it isn't too big to be self supporting. Sealed against the dome with a good sealant as suggested above. Sort of a more permanent derivative of your cheap and nasty ground sheet idea.
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