Wow, lucky girls! You did a nice job! I discovered my girls did not like walking along a bare plank... I used a 1 x 2 to make stair treads for them and they were much happier! The wood can especially be slippery after a rain or heavy morning dew, so it might help. If you paint them white it can help them see where to go in dim light, too. My girls follow a food cup right up the ladder to the coop door. I dump a little in the coop to reward them going inside.
Again, nice job!