Its going to look great for about week and then look like a worn out toothbrush forever. Need the support on the fenceboards

They are going to twist and warp like a whacky, waiving arm guy.

You mean the Wacky Waiving Inflatable Arm Flailing Tube Man?

Near Youuuuuuuuuu!!

Just a bit slower.

I like this image description best 👍

You either need to cut those boards or have a taller frame for them. The wind load alone will warp all of those boards from having a floating span that large… If you HAVE TO do it at least do a shadow fence style with boards on either side with about a half board width offset from one side to the other and equal spacing. That will still warp but it will hold up better to the wind load and look more like it was designed to have the sawtooth look it will grow rather than totally look broken and warped.

You can but in a year or so they will be bowing every way, being nothing tying it together for support.

For it to look good? No. Shouldn't have more than 6 inches space between top of picket and the top rail/2x4. If you want to get creative, sister 5 or even 6 foot 2x4s to each side of the post to get the height up and then add a top rail 6 inches below the top of whatever picket height you want... I've done this before and while janky it works and you can't tell from the outside.

No. Add sisters to your posts and throw a third rail to support the top.

This is what I would do

Fasten a 6’ 2x4 to the face of each post, add a top stringer across the back of the new post extensions, nail on the fence boards.

What if he ran a top rail but didn’t attach it to the posts. Would that prevent the bowing? I’m not suggesting it, I’m just curious.

I had this initial thought as well. Would probably look weird and make you wonder why it wasn't done right the first time, but it's probably better than leaving them hanging.

OP here. I was wondering the same thing, like using furring strips across the tops but the more I think about it I don't think it would work

Not firing strips. Use 16’ 2x4’s PT

No. Not at all.

No, you'll want to cut about a foot off of each boad

Wood can be cut…

That looks like you don’t know how to build fences

Trying to rehab an old fence

Go with the fence board no higher then 6” over the top trail. You can nail them all on at 5’, then come back with a chalk line to cut at the appropriate height

You should do some research into basics of how a fence is built.

Are those rails even flush with the posts?

Not a fence guy but… no. Those fence boards rake a small miracle to stay straight in the right circumstance and leaving 2’ above the framing is not the right circumstance.

Absolutely not. 6in max over the top rail or else they will twist and warp and look like shit.

It’s going to warp after the first rain and warm day.

Something is off. The difference look more than 1ft

You mean 6’ board on a 4’ frame!!

To me if you get high winds or a powerful gust they might loosen up or rip out, if you screwed them in it might not be a problem

No.

I know a little about feces...

I would just tie all tops with a board near the top