Thank you all! Referring back to OldPaint... Is the extra support for 1/2" alumalite absolutely necessary? I'm in upstate NY so not to crazy as far as weather. Just damn cold!
I would put a 2x4 support on the back top and bottom all the way across.
Since you may get a lot of snow in the winter I would not put it to close to the road.
That big wall of snow from the snowplow can pop the panel out from between the posts.
It would be more sturdy if you could put the posts in a couple of feet on each side of the panel. It is a different look but much more sturdy.