Looks like you have a lot of vertical space to stack your growing containers.
Here's a paper (the first 2 pages) about growing oyster mushroom on coffee grounds:
http://link.springer.com/article/10.1023/A:1014999616381#page-1
A Brazilian paper about growing oyster mushroom on coffee husks.
How they are growing them in
Cuba.
Adding in rice straw and banana leaves to the media
here.
As you can see, there are many ways to prepare media to grow your mushrooms on. If you study what is common to all the methods and try to repeat that, you should be successful in your efforts. Once you have a recipe that works well in your climate, then you may think of other waste materials that you can also use.