I got the link by going to your coop build page, put my cursor on the very top line of the page, did a right click with my mouse, and selected 'copy link'. Then I put my cursor in the post response box, and selected 'paste'.
Hope that make sense.
@sumi 's post (the first post) said they wanted 30-40 entries, then they'd give about a week's notice prior to it closing. I haven't gone back and counted how many entries so far but I'd say the contest will be open for a while yet.
That's a fun looking coop @chickencheeper Can you write up your build process in the form of an article? See the first post on this thread for the "how to" instructions.
Sounds like you put a lot of thought and work into it! The coop contests run periodically so keep an eye out for the next one and best of luck with your upcoming flock :thumbsup