Modularization is not simply placing equipment on a skid. Schedule value appears when process, utilities, structure, automation, and validation boundaries are defined early enough to let site and system work proceed in parallel.
Freeze the interfaces, not every detail
Module dimensions, loads, utility envelopes, material connections, network architecture, access zones, and acceptance criteria need early control. Internal fabrication detail can continue behind those stable interfaces.
Use the FAT as an integration event
A meaningful FAT exercises recipes, interlocks, operating modes, alarms, data exchange, and representative utilities across the assembled line. This moves commissioning work away from the live site.
Protect future expansion
Physical tie-ins, controls capacity, utility headers, and material routes should reflect the credible next scale. Modularity is most valuable when it simplifies both the first installation and the next one.