building materials for accommodation of injured barn owls?

[XxlillgalxX]

I need to know what building materials are needed to make a nest box to accommodate an injured barn owl.

 

[Huge]

You need either 8 or 12mm thick external grade plywood, some galvanised nails or screws and some woodstain/matt varnish to finish it. You will need a saw, hammer and screwdriver and paintbrush.