How about a Carcoon to store the car in then put a tent over the top?
The carcoon will keep the car dry and sealed then the tent on the outside will keep the weather away from that. Tents big enough for a car are only a few hundred pounds and it can be used afterwards for barbecues and parties.
Marquee, Gazebo and Party Tent Sales - Marquees, Pop Up Gazebos and Party Tents for Sale
Alternative is a shipping container in the garden, Big, secure and good for storing those building materials but can drip like crazy with moisture or put an awning on the caravan! 
Craig.
Dax Tojeiro, + 355 Chevy + Tremec box = In storage and possibly for sale, make an offer...
DB Hardtop still in the garage.
Polishes to date = On hold.
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