"Austringertx254 " who are you? Forum rules require you to sign your name.

Alex,

The plastic panels that were mentioned are very common in low end public bathrooms. They work great because they are easy to clean.

Its a very expensive way to line a mews, but would work quite well so long as they are well supported so that they dont shatter and create a sharp edge.

I would, as suggested, consult with falconers in a similar climate to you - I definately do not fit that description - but those "R" panels work just fine without any interior sheeting in most places. You do need to be very careful that none of the fasteners missed though. Hawks have an almost supernatural ability to find the one nail you missed, and take themselves out by impaling themselves on it.