Building large flight cases and transport boxes is easy and much cheaper than buying them. Hinges, locks, fittings and aluminum rails is readily available at
DIY Road Cases™ Store - Road Case Hardware
Large Heavy Duty Cases for transport of tools
DIY Road Cases™ Store - Road Case Hardware
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Phenyx Pro Extra Large Size Carrying Case Customizable Pre-Diced Foam Aluminum Alloy Sturdy Build for
How To Build Flight Case and Transport Box
Large Mirror and Picture Moving Box
Two Very Different Ways To Protect Your DJ Gear
Making of a DIY Flightcase : 9 Steps (with Pictures) - Instructables
Stage Plus Flight Cases
Transport Storage Case (2m x 3m Stage)
Buy a custom-made flight case - Thomann Case Factory – Thomann UK
Aluminum Cases – Cases By Source
5 Star Cases, UK's Leading Flight Case Manufacturers
Road Case Design & Manufacturing – Armor Road Cases