It sounds like you already have the shape cut out. Also sounds like you're using plywood? If you're using plywood, I would consider using thinner plywood, say about 1/3 the final thickness, cut the shape out of the center piece, then glue them all together. You could also maybe use plywood that is half the final thickness - it'd be a little more difficult then, as you'd have to chisel/router out the shape on one or both pieces, then glue together.
Last edited by jeremymcon; 05-12-2016 at 08:12 PM.