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Change size thermoash & drying-swelling cycles. Questions.

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Please help with finding information.

I want to make a kitchen table. I will handle food (meat, vegetables, bread, etc. ) on the tabletop. There will be a lot of moisture.
Tabletop will be out of thermoash (392- 410F / 200-210C). A three-layer oil coating is planned for additional protection.

But I have no answers to some questions.
Residual humidity in wood is not guaranteed by my supplier. This is a problem in my location. 
Thermowood is dead wood. Such wood has different properties. 
But I can't find exact information on how to resize such dead wood.

Clarifying questions:
Is there any need to calculate drying-swelling for thermoash?
In what range can the tabletop resize?
How much to change sizes A and B (look drawing)?
Thermoash warping maybe? How much inches (mm) my tabletop can deform?


I want to make a simpler table design. Resizing information is needed to create a correct fix & endurance design. 
But there is no information anywhere.
Many thanks for all useful answers!


Edited by SchraubenMeister

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Looking at this page suggests you dont need to be worrying about moisture expansion and warping with such low moisture content. 2-4% is so slight I cant imagine any movement of consequence will occur.


Interesting product. Saw some in Lathams many years ago but not seen it since 

Produced from ash, the most prolific white wood in our mixed woodlands, Brimstone Ash is the most popular item in the range.


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