I remember a wood overhead door
That thing was brutally heavy. If I wanted a "wood look" door I would just attach light weight, thin panels to an insulated steel door. The panels could be made from a Marine plywood and stained or painted to achieve the desired effect. The lifter would have to compensate for the added weight of the panels. It would be the easiest way to get your wood look.
Another idea would be to use a wood grain plastic laminate as used on counter tops. Many grain types and colors are available and it may weigh less than a plywood substrate.
Finally, a Faux wood grain could be applied with a skilled paint application.....
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)