Regal plastic on Reno would be my first stop looking for panels. They do a great job of cutting and may have just what you need.
My reply too. Regal Plastics.I have bought many different plastics from Regal plastic and think there is one in tulsa.
They will cut whatever size you want of something.
Maybe call and ask what they have but I do like the idea of trim it out like @montesa mentioned.