A hexagonal lattice is a solid starting point—each cell naturally channels light in a consistent pattern, and the geometry minimizes gaps, which should cut evaporation. But make sure the lattice angles align with the sun’s path; a slight off‑angle can scatter light before it reaches the root zone. Also, the structural load of the glass or polymer panels will increase as you add more layers—consider a lightweight core or a hybrid framework. If you keep the cells tight but give the panels some flexibility, you’ll get both focus and durability. Just remember that perfection in geometry can blind us to simple airflow tricks; a little venting might still be essential.

Sounds solid—just watch that the titanium isn’t too heavy for the lattice, and keep the ventilation slots slightly above the beet beds to avoid damp spots. If the microclimate stays stable, you’ll get the yield you’re aiming for. Good plan.