Thanks for your answers. For some reason my internet connection is too slow or has other issues... only get time outs when trying to search :(

Jazzafterdark:

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Women need to cover up when passing through Saudi. Women are not allowed to drive
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Do you mean headscarf only and any wide, non-reveiling clothes or do I need to get an abaya? If so, any recommendations for getting one cheap? :D
Will be quite nice for once to be driven around instead of driving myself :)

My hubby is under my sponsorship, actually. Might that be a problem?

Any ideas about the insurance costs for Saudi and Bahrain, and will the Saudi one still be valid when we drive back some days later?

I guess it's probably less fuss to just fly, but who knows if we ever get the chance to go into Suadi again. And judging from GoogleEarth, there are some nice rock formations near the road that I need to visit, something I dearly miss in Qatar.