Nicely done! I have a hoop house that I built out of cattle panels that are arched to the ground and secured by 2'x6' boards. Wiggle wire is good stuff, and what I have used to secure the plastic. Mine is a cool month setup, and I remove the plastic over the warm months, for aesthetic reasons, and to keep heat down.

I also use the rubbermaid stock tanks for my FT (150gal, not 300gal like yours), but my setup is in my garage, and not in the hoophouse. Interesting to see someone use similar/same materials with a different design. I look forward to future updates. Much success!