I used 20 gauge steel wire to attach the hardware cloth. I drilled a couple of small holes in the plastic at each point of attachment, threaded the wire through and twisted it like a twist tie then clipped it close enough that there were several twists on the wire.

I put the hardware cloth on the inside of the bin so that it would be between the rats and the holes in the plastic, in case they might want to do some chewing.

The feed silo is just hardware cloth twist tied in the back with steel wire and tacked to the rear wall with a couple of ties like I used for the hardware cloth windows.

I put the windows on the sides so that I can stack these things up if I want to and still have air flow.