Hi everyone (new on here today) just thought I would add that my chidlren's school have recently put out a plee for 2ltr plastic bottles from the local community as they were intending on building a greenhouse out of them. I was intrigued to say the least! However, after having an allotment for 3 weeks and inheriting an unsafe structure on the plot (the only structure there is) I am now quite interested in this as a project for myself. Any further tips would be great!