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isherwood
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Don't use plaster. Use modern drywall joint compound on drywall installed flush with the plaster.

My former 1950s home had the same situation, with 3/8" drywall behind 3/8" of plaster. I describe it as the best walls I've ever owned--very durable and easy to work with when adding outlets, etc.

Shim out the framing so 5/8" drywall lays flush with your plaster. Use modern taping techniques and materials to finish the joints. Texture as required, prime, and paint. You'll have a flatter surface with much less work than you would with plaster.

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isherwood
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