Ok here I have split the support template into three pics so they are easily printed on A4 paper,
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you need to set the length of each image at 203.33mm in photoshop and print from there.
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Sorry but I don’t know how else to do it as just printing them in windows only wants to fill the page.
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Cut the middle one to the lines and then glue them together making sure the line in the centre is straight and the total length should then be 610mm.
The plywood should be 9mm thick and decent hardwood “engineered” type, usually with 7 layers.
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Fitting the cut pieces together will need two more bits of ply 50x135x9mm and 165x70x9mm fixed where shown on the template.
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A few bits of plastic will have to be removed to fit the support inside like so.
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If you are not going to cut the mandibles from the hull like this...
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and will just be using the support for fitting to a stand, then you may be able to do away with the long straight bit at the front of the ply support and also leave the plastic strengtheners at the front by the mandibles on the bottom, changing the ply to fit there accordingly.
View attachment 410328 Thats a bingo