Although war machines and their crew are treated as a single model, the models that represent the crew are most often based individually, separate to the war machine itself. Accordingly, a war machine’s profile will give a base size for both the war machine and its crew. The benefit of basing a war machine’s crew separately is that, for each Wound the crew loses, you can remove one of the crew models as a reminder.
During deployment, the models representing a war machine’s crew should be positioned adjacent to and in base contact with it. Once placed, the models must remain in position, adjacent to their war machine. Individual crew models should be ignored for the purposes of measurement or when determining line of sight.
However, many players like to base their war machines and crew together on a single large base, making of their war machines small dioramas that show the crew hard at work. This is perfectly acceptable.