Floor heights and support arrangements needed adjustment as mechanical layouts evolved. Digital modelling in SolidWorks and ANSYS allowed rapid redesign and re-analysis, ensuring design integrity while maintaining schedule. Transport and workshop lifting restrictions–Module sizes were limited by transport width and height, as well as overhead crane capacities in the workshop. To Overcome this, customised bolted connections and special lifting studies were developed, enabling modules to be trial-assembled and safely lifted within restricted spaces. Balancing standardisation and customisation–The need to keep modules as uniform as possible for fabrication efficiency, while adapting supports for pumps, tanks, piping and mechanical equipment was resolved through a standardised framing template with targeted local modifications. Fastener performance–During assembly, some galvanised nuts stripped under the specified preloads. According to SANS 1700-2 (ISO 898-2), galvanised nuts must achieve the same proof load as uncoated nuts of the same property class. A Skidmore torque–tension test confirmed that a portion of the supplied fasteners were non-matching assemblies. Several nuts were marked “|8|”, denoting property class |8| from the withdrawn DIN 267 Part 4 standard. Such nuts have reduced loadability, with lower proof loads than ISO class 8, making them prone to thread stripping.The problem was compounded by galvanised assemblies where nuts may be over-tapped and bolts undercut, reducing effective thread engagement if not supplied asa matched set.The issue was resolved by enforcing certified supply of matched manufacturer assemblies with correct property classes and lubrication, ensuring joints achieved the required pre load capacity.