bloominholes2fill said:@Sallymander great idea in theory. 
But in practice, unfortunately, the real and false tongue and groove paneling requires more verticle support than the current posts which are spaced at 8ft apart.
Couldn't that be added as well? Essentially, "N" would be rebuilding the fence anyway.
While I've got you... what do you think about having the boards run at a 45 instead of a vertical? I've done that with other projects, but not with one that didn't touch a "bottom." (I tend to find the straight up and down a little boring.) "N" could run a horizontal support to give the mitre cut something to sit on.
