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Probably the biggest issue with using the 12" tube is that the focusser will be pushed further off centre possibly requiring a slightly larger secondary mirror. That and the slight weight and diameter increase.
If it's a temporary situation till bigger and better arrive then I'd go ahead. Otherwsie you can still build a truss or Serrurier type OTA with alum tubes and ply. Quite a bit cheaper than carbon etc. Depends on how much effort and time you want to put in.
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