It sounds like you are doing this entirely in model space. Is that correct?
The better approach would be to utilize a paper space layout and one or more viewports. Viewports act like windows allowing us to see what we created back in model space. It is the viewport that gets a scale assigned to it thus avoiding scaling objects in model space. You could have a layout with a half dozen viewports on it and every single one of them could be assigned a different scale.
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