Best structure for zone 9b

Looking for structure advice—zone 9b, 110°F summers

Question

· Torn between high tunnel vs wooden shed (modified with windows/vents)

· Heard polycarbonate greenhouse won’t work in this heat

· Are these my only options? What would you recommend?

(Kokedama pics for inspiration—thanks in advance!)

Situation:

· Out of room indoors; need separate workspace

· 13 ft deep × 22 ft long space between house & cinderblock wall → humid microclimate

· July winds from west along the 13 ft side

· Gravel ground

Needs:

· Create & store tropicals (zones 9–11) + kokedama/bonsai supplies

· Manage thrips/mites → need airflow + agricultural screening

· I anticipate I will need a Solar exhaust fan + one fan per side. I anticipate using 150-micron hole size (81 x 81 mesh) for windows / vents to keep pests at bay.

I will be spending a lot of time in here working.

Structure considerations

· 10×10 or 8×12, min 7 ft ceiling

· Half gets afternoon shade from tree; can add 70% shade cloth above structure if needed

· Not DIY-friendly → prefer prefab with modifications

· Budget ~$3k (temporary; will grow with business!)

What do you suggest?