So to avoid problems with only being able to dock to one object at one time, the models with 3 and 5 modules mated together are all merged together prior to being made a .pof as single larger models. I guess in those instances, you'd make each module (though still connected to each other) a separate subsystem that disappears when distroyed. It could present a problem if the player destroys the module subsystem closest to the drive section, then the others would appear to be hanging in space, but following behind the drive secion without a tether. You could however, have a spine that runs through the center of them all and is only destroyed when the entire model is destroyed, then if one module subsystem is destroyed and others behind it are not, they would still appear to be attatched to the drive section.
Later!