The instructions that came with our kit have been slightly difficult to follow. There have been a number of calls to Oregon Valley Greenhouse today asking for clarification on just how to install these steel end walls. In the instructions It says to use a string line to help line up the holes for the four pipe that are the main support for the end wall. However, after speaking with a very helpful gentleman with Oregon Valley (again, great customer service) he simply said to not worry about the string line, "it doesn't work" but to simply plumb the supports to the bows and all will be great. So that's what we did.
He also told us that the concrete for these pipe won't be added until we have fully assembled the wall (it doesn't mention this in the directions anywhere). Oh, and we attached the hip boards before starting the end wall.
Here is the completed end wall with the horizontal pipe leveled and in place. This was much easier (and less materials) than our other four hoop houses.
The doors have plenty of clearance and swing nicely! Now to do the other end.