For one, Evolution and common ancestry are from the interpretation of evidence and not based on real observable evidence
Pardon? The theory of evolution is, if you will, an "interpretation" of the evidence -- yes. However, no one has offered the slightist hint of another scientific theory based on this evidence that explains the evidence. If you think you have another one you could open a thread to explain it. You can list a representation of the evidence that you are including (there is much to much to list all of it) and then show a cohesive alternative explanation.
Evolution having occured is, of course, is the very real observable evidence. The theory (interpretation of the evolutionary changes we see) is based on this observable evidence. So your sentence above doesn't seem to make sense.
To simplify, at various point in time spread over nearly 3.5 billion years the life forms on earth have been different. The nature of the changes with time supplies samples of life forms with a particular kind of pattern through both time and geography.
You need to explain this pattern. Then you need to explain the relationship of living things to past life. Then you need to explain the relationships between extant living things. When you have it all sorted out then you have an alternative interpretation which you may put forward for testing against the current one.