The greenhouse overhead end view is shown in the diagram below.
Of particular interest is how the top of the door frame is tied into the upper purlin for end strength to resist high winds that would otherwise bow in the ends of the structure.
Tieing into the upper purlin also keeps the bracing up high on the structure so as not to interfere with gardening that will be done at ground level and perhaps as much as 6 feet above.
The end can be tied into the lower purlin as well, but this could “cramp your style” a bit with respect to gardening near the end wall.
Guy wires will be used to connect earth anchors to portions of the building to offer additional resistance to deformation at the ends caused by high winds.
The overhead end view doesn’t show the location of guy wires and anchors, since this wasn’t part of the original design.
The fabrication and installation instructions will detail this revised part of the structure to include guy wire and anchor locations and configuration.
Care must be taken when positioning guy wires so as to avoid blocking or restricting access to the pedestrian door at the end of the structure.
There is no sense building a greenhouse to meet your needs for vegetables, as part of your plan for frugal living, and then make it inconvenient to get to the vegetable garden because of poorly placed guy wires.