I laugh because you will line the cage with shavings... and with one wingflap
**poof** shavings everywhere all over your house. Also, pine is not very safe for birds.
Just paper is ok, you will just have to keep on top of changing the paper morning and night.
I did find a site that sold grates, I was looking for one a few years ago. If I find it I will link it, maybe you can pick one up in that size.
Yes this is the issue I had and why I was looking for a grate. My little one would play football, so I had to constantly change papers to keep her toys clean.
I wish I knew the solution.
I will add that if this turns out to be Marina, you may want to not line the cage at all to avoid nesting behaviours.