Well, that would be lovely. However a professional adds a level of ...hmmm...professionalism. Plus I have NFI how to go about making one (which didn't stop me from building a deck large enough to see from space).
I also want to incorporate features like being able to turn part of the track into a water slide (hey, my land is slopey and pond liner is a fantastic material) and I have some boulders that could be interesting
Here is an early view of my backyard - I now have a chicken coop and a small vege garden and an almighty deck off the house (it is about 4m high and covers 50m2)
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