I dug the post holes yesterday. They weren't too hard to dig back in the shady and humus rich soil of the back part of our yard. Our yard is an anomaly in the mostly clay and limestone filled Tennessee landscapes!
Putting in the arbor was a simple job. I used two 4x4 post pieces and two pieces of decking cut to 78 inches for the top cross pieces (the posts are set 64 inches apart which allows for a 6" overhang on either side of the posts). To connect the top crosspieces I opted for a heavy duty screw that is normally used to attach a ledger board to a house for decking. These bolts/screws worked perfectly for this arbor and look pretty classy all coated black
Once I pieced it all together on the ground and placed some gravel in the post holes I raised the arbor upright into its location. I made a slight adjustment to the gravel in one hole and checked for level several times before securing it.
To secure the arbor I placed two sawhorses nearby and clamped two pieces of decking to either side of the arbor. The decking was resting on the sawhorses and should remain in a fixed location until the concrete can cure.

My other find was this echinacea. It's called Sombrero Red Coral. I think you can see why! The blooms are a spectacular orange that changes to red.
The perimeter wire line fence still needs done but the arbor gives it a good start! So far the deer have left the hostas alone without the fence so maybe my planting strategy if mixing deer resistant plants with the hostas is working!