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I'm restoring the door to my dumb waiter. The door is 1" thick, plywood core, tin exterior (1/32"); the door is original and dates back to 1939. I want to make the door completely flat, then paint it, but I'm not sure how to fill in the recessed panel such that is does'nt warp or crack later. The panel is 36" x 7", 7/8" deep.

My first thought was to use something solid, like MDF, to fill in most of the space, then use fiberglass or metal-reinforced bondo to fill in whatever space remained; apply another coat of fiberglass/bondo on the entire face of the door, sand, paint, done. Is that a good solution?

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    I think it makes more sense to construct a replacement door and store this beautiful antique for potential use by the next occupant. A sheet of MDF with several coats of paint will probably not warp. – A. I. Breveleri Nov 5 '17 at 2:53
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    @A.I.Breveleri I agree 100%. Please make a new door rather than attempting to alter this one. – jqning Nov 5 '17 at 4:07
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Something to keep in mind with this dumb waiter door is that because of the vertical shaft and what terrible things vertical shafts can do with fire; that is why the metal door is installed there, to forestall the spread of fire.

You could over-lay this door with good quality 1/8" or 3/16" plywood, say Baltic Birch or Mahogany. Install ribs in the void to fill; or you could use a filler panel the right size. No need for bondo, the plywood can easily span an inch.
Use the proper adhesive compatible with the substrates. Weight the whole thing for 24-hours for the glue to set. You will need to adjust your hinges slightly to accommodate the difference in depth. Then paint to you hearts content.

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