How often you need to change bedding can depend, kinda gotta try it out and see.Thanks for this explanation. I envision using a deep bedding method.
This is exactly how I've been treating my run and it's been working great.
My vision was to do something similar to what you're doing except for a few changes. I was going to skip using the poop boards with the expectation that I'll change out the pine shavings more frequently than you. My goal was to only have to change out the shavings every 3 - 4 months. I figured that if I kept the size of my flock constant (fight the chicken math) the size of the coop would determine how frequently the shavings would need to be changed.
Your dry climate probably will help.