I just found this website called http://www.reapscotland.org.uk/ and they have a bunch of interesting resources you can
download
for example about composting or a plastic bottle greenhouse
No open licenses though :-/
And it is not an outstanding publication. Stuff like that can be found on the web a lot. Which is great. Take this one as an inspiration to google for “Plastic Bottle Houses”
Maybe our building material should be used as something else first!