SPG, you will get more life out of that panel, if you put a layer of caulk on the open ends and then put on a couple 1"x2" fir strips to keep the moisture from the sheet edge. I did this on my new one, well 4-5 years ago and I have "0" water penetration at the corner joints. Same wood exterior as you have.
I also stood my sheets up so the running joints where vertical to the ground, then caulked and fir stripped those as well.
Looks good, appears one young hunter is ready to "get it on" too