When evaluating aluminium cupboards, prioritize the grade of the aluminium alloy, typically 6063-T5, which offers the best balance of strength and corrosion resistance. Ensure the panel thickness is at least 0.8mm to 1.2mm for structural integrity. For the surface finish, powder coating or electrophoresis is recommended to prevent oxidation and provide a high-quality aesthetic. Additionally, check for honeycomb aluminium core panels if you require lightweight yet high-strength doors that resist warping.