Build the base using 2" x 2" pressure-treated lumber and secure them with screws, ensuring they are level.
Attach end caps to each outer corner using a shelterlogic - 12x20x8ft and glue, nails, or screws to prevent water leakage and provide extra support for framing.
Add corner posts by nailing or screwing two pieces of shelterlogic - 6x8x6ft at each upper corner detail of the carport frame.
Build a firm carport frame using plywood, metal track, or stretch plastic, with wood being the most common material.
Install a greenhouse spring lock track on the north wall frame to keep the door in place when opened.
Slope the south wall frame slightly inward to prevent water pooling around the plants.
Add greenhouse plastic and ensure proper ventilation, including upper vents and doors/windows for CO2 escape.