George, your rails look terrific! I'm in the process of doing something very similar with three rails rounded at the ends as you have them... my bottom rail is about 3/4" up from bed side to accomodate side spare tire mount... each rail is 2" with 3/4" space between. The bottom rail extends all the way to the back and aligns with the end of the bed to keep lines inline. The top of the rails line up with the body wrap line around the cab. One thing we decided was to NOT merely divide the three rails lengths into 1/3rds... it would make the bottom rail look too long.
I'm also going to add a brake light into the center of the middle rail or top rail.
