A sunroof assembly with a composite water management assembly having side rails with a water trough connected at one end to end caps and to a pair of corners at the other, which connect to a front rail at substantially right angles to the side rails. This composite assembly can be connected by vibration welding. A reinforcement bar can be connected at substantially right angles to the rearward end of vertically oriented slide tracks snap fitted into substantially the length of the side rails. A pair of mirror slide mechanisms with vertically oriented mounts are retained, but free to slide, within a channel of the slide track and outboard of the water trough. A movable panel such as a glass sunroof are attached to the slide mechanism. A sunshade can be added that also combines water shedding ribs to channel water to the water trough.