Johann,
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The reason you have not had a response yet is probably because nobody who has seen your post has any experience of this machine.
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Personally I have never seen any mention on this forum of the type of machine that you mention as these "Ox" kits are more USA-centric than UK-centric.
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It's quite possible that you, knowing the cost of your build, are the person best able to determine what you can charge for this machine.
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Sorry I can't help.
Andy