Marine Gangways and Walkways SPIIND designs and fabricates marine gangways as required for various projects along with all related structures and electrical installations. Shown here is our largest gangway project to date, a 35 metre long x 3.5m wide x 2.5 high aluminium gangway welded to AS/NZS 1665. General Light to Heavy Structural Rotoma - Rotoiti Waste Water Treatment Plant