Well done!
I have runs just like that.
The zip ties will break really fast in the weather. Replace them with wire to hold the mesh to the frame.
I put cage-mesh/hardware cloth around the bottom of my run so the bottom two feet are stiff close mesh. Partly this was because a young pullet stuck her head through the chicken-wire and got hung up and died so I wanted finer mesh down where small chickens might be. I think it probably improves predator resistance a good deal as well -- you can't pull on the hardware cloth and bend it upward to crawl under, it's too rigid, and if you're the size of a racoon you're not tall enough to grip the chicken-wire part and put your back into it while pulling.
I used J-clip type cage-clips, and lots of them, to attach the chicken-wire to the hardware cloth and to attach the chicken-wire sheets to each other so the join is close and strong.