I agree. Plywood is fine for the stringers if that's what you want to do, but dimensional lumber is my preference for the engine cradle area. I used a collection of 2x6 and 2x4s trimmed to size I needed.
To your other concern about getting the cradle back to it's original dimensions, I understand your concern, but I agree with Salty that you need to try your best but sometimes close it good enough for this work. Take lots of pictures and measurements.





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