I would put it on stands, remove the brake pads, lightly grease the discs, spray WD40 over the suspension parts and stick a tarpaulin over it. All box sections plus the underside should’ve been treated with waxoyl or similar if you’re serious about preserving it so rusting shouldn't be a worry. Spray WD40 on underbonnet items, put a drop of oil down the bores and turn the engine by hand a few times to wet the bores, then put the plugs back in.
I wouldn’t bother with a Carcoon, but I wouldn’t store a car outside for more than 1 winter either.