you could use a helix
cut off the top half and extrude the outside a bit. although I dont know how you'd stick the giant pole shape down in the middle

maybe you could start with a cylinder, make it as tall as you need then draw in the helix around it and extrude that out.

although that could be a lot more time consuming than the above and sticking a pole in the middle and then just adjusting the verticies on the pole until it matches the helix so you can delete some faces and merge

the hood itself can be left overs from the helix that you use to make the slide.
so you delete the top half of the helix but leave the end.
i'd show you what i mean better but this computer has no maya