jansan1,
We have always thought the top lifeline was a bit low. Seems to be about knee level.
We found an idea that works for us. Rather than try to fit a wood rail on the top lifeline, we rig what we call our, "high lines". We bought a red line that we rig from the highest point we have at the bow, to a high point on our upper side stay, then back to as high as we can get it aft.
It's easy to rig when we head out, but we take it down and out of the way when we are at anchor or in the slip.
This was off the Pacific coast of the Baja.
Greg