There's no trade secret here, since the drawings are published. You have the rights to build anything from the drawings, provided they aren't patented, which is another issue entirely.
Copyrights here only affect the actual drawings of the product. By default, the author is granted copyrights. That means you can't publish your own book with those drawings, for example.
Copyrights here only affect the actual drawings of the product. By default, the author is granted copyrights. That means you can't publish your own book with those drawings, for example.
But to actually build the chassis, go for it.
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