As above, I'm going to be taking my Z3 (1999 / 1.9 / Roadster) off the road, which so far has been my daily driver, and get a VW Up for a commuter (M25, wooo!

). The Z3 will be our summer car, but needs some work.
How would you recommend going about storing the Z3 on a driveway (No access to a garage) and working on it piecemeal over a few months? Also, any idea on insurance?
Additionally, the ABS sensors need a clean, as the dash lights are on, but the system itself hasn't failed.
The bolts holing the sensors in have rusted to the point where I am unable to use an allan key to remove them. how would you go about removing and replacing the bolts?
Finally, how likely is it that a decade from now, that the electronic parts ie. sensors etc, will still be available if something else breaks further on down the line?
How can I most cheaply get the following fixed?
-PCV Valve (Currently making a high pitched whining noise)
-Seized ABS sensor mountings
-Rear window (Currently gorilla taped shut)
Many thanks!