Ya I made that same trap using 2''x4''s. widened the interence to 1''-1/2 at the sides and brought the bottom screen and oil pan 3/4'' forward out side the front edge of the hive body. Catches some rain water but not enough to be a problem. Used the Dadants' beetle trap pans. I'll say this I lost 5 hives cause to SHBs' over 100 (9'') inch frames of honey ruined in one weeks time. I haven't found more then 2 beetles out of 15 hives since I put this type designed board on them. And do says catches hand fulls of SHBs in the oil pans. The beetles move in and out of the hives more frequent than one would think, making the enterence peace and location of it important.