Plan access, racks, drainage, water, pest exclusion and air openings around the tasks operators must perform. Leave workable routes for loading, inspection, harvest and spent-material removal. Rainwater and wash water should not create persistent wet areas or flow back toward clean work. The structure must suit local wind, rain and fire risks; use competent construction advice.
Keep electrical equipment suitable for damp use and have installations checked by a qualified electrician. Do not put improvised combustion heaters in an enclosed growing or working space. Heating, humidification and ventilation affect both crop conditions and worker safety. A low-cost structure still needs a clear operating and emergency plan.