We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
PS, you can rest the bottom of the panels on the ground (they're galvanized) if your old posts are weak, but you'll play hell leveling the panels --which you'll want to do, even tho the horizontal lines will be far junior to the level line of the wooden rails. Reason for this is purely aesthetic, so maybe it won't apply, but i think it does.
Ergo, hang the bottoms in the air but as close to the ground as you can, and still get away without too many step-ups or downs as you are forced to confirm the terrain along the length of the project.