Design Blueprint: Insulated Fish Box, Wall-Sized for a 48-Hour Trip

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24115070): An insulated fish box of 1.00 m x 0.60 m x 0.60 m external size holding 40 kg of fish and a 25 kg ice charge at or below 4 degrees C for 48 hours at 35 degrees C ambient, built either with expanded polystyrene walls built to 70 mm or with a sawdust-filled double wooden wall built to 140 mm. Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.