I've just about finished with my coop and run. Chicks are arriving Monday. I've looked at some previous posts regarding roost designs and specifications.... and there seems to be a lot of varied information. Looking for a little help.... I'll have 6 Barred Rocks. Is it better to have a 2x3 or 2x4 layed flat (flat side up) for the chickens to roost on.... or is a 2x4 ripped down to 2x2 (which would be 1.5" x 1.5") better.... or is a tree branch about 2 inches in diameter the way to go. I realize there are probably personal preferences.... but just looking for some suggestions. Thanks very much for the help.