I'm planning to build an aviary for my Snowy Mallards. It's going to between 30'x30' and 30'x40' and I would like to put netting over the top. What type of netting have you used on your duck aviary? Also is there any suggestions or comments on what to do and not do. I plan the sides to be 6' tall and the center of the netting to be about 8' to 10' high. I'm also interested in pictures of your lager aviaries. Thanks.