Good idea to close the opening under the deck off for safety and purpose. Wood-framed wire trellis - would be a beautiful trellis for cucumbers.
DIY Garden Trellis out of pressure treated wood and cattle fencing
diy trellis More
w/ an overhang and greenery as walkway to garage?
Circle trellis -- would be very pretty with morning glory vine.
wood and copper, simple and elegant gardentrellis_lead
DIY inspiration | Homemade Twig Trellis
DIY Trellis & Raised Garden Box Combo
Jasmine vines trellis - I still want to do this on our wall... maybe larger?