Rather than tenons half laps would be simpler.
Have you considered torsion boxes? Make a wood grid and then skin it with thin material?
I've used half laps because I can't/am too scared/unskilled/lazy to make tenons. They don't have enough strength and they do nothing to prevent warping.
I won't be making doors like that again.
@Grumpy_Git started
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Rather than tenons half laps would be simpler.
Have you considered torsion boxes? Make a wood grid and then skin it with thin material?