The fermented feed can wait till you get the chicks settled in. Your choice re: using medicated or unmedicated feed. Do your own research re: that so you are making an informed decision based on YOUR research, not what some one else tells you.
Do you have any wire fencing laying around? Something stiffer than chicken wire? You could use that. If you don't have any of that, you can cut a tomato cage open, flatten it out to the right height, and wrap some chicken wire over it. Cover all rough edges with tape. (I like duct tape for...
The biggest negative I can think of to your plan is this: chicks create a LOT of dander. It is a super fine oily dust that permeates all surfaces, including vertical ones. They also can be smelly, though that is far less of a problem, especially if you put them on fermented feed. I have...