I try to think of ways of making the Gilbertson style. Besides the regular streaks of black paint on white pvc to imitate birch, I’ve done a couple of college themes, drawn bluebirds and cardinals on them. I’m not a very good artist though, lol.
The thing I don’t understand is why the Gilbertson birdhouses I’ve seen have dark insides to them which makes them hotter, Imo. I always put half circle vents at the top of mine too. Another reason I’m going with 6” is for more space between the bluebirds which may make it cooler in there.
I believe the pvc pipe is the same pvc that is used in home water lines.