You are looking for a regular size metal birdhouse. Getting the log will be the tricky part.
the log host is up into the barn via a pvc pipe. Your fingers will not be able to grab it but I know you'll try.
you'll have to go thru a back door. When done correctly the log will just fall out all by itself.
sign the log & gently place back in the pvc pipe until it holds.
Easy Breezy!!