I want to add on to my home using trash. (Recyclables). Any tips?

I want to add to the house through our back door. Just an extra room. I save tin cans, plastic food containers, wire, and some cardboard from boxes. I have seen this done but it was on a brick house and the house was on the ground. I live in a Mobil home. Any advice? Do you think this would be good or just a waist of time. I have some pretty good ideas. I just need some feedback.

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