>>>>>but didn't address why the UCS seems to be skewed I will upload the file (its very messy, please don't judge, lol)

Your drawing is not flat. If you will look at it from FRONT view, you will see:

So you need to flatten it with FLATTEN command, but I'm afraid this could take a lot of time because there are a lot of objects in the drawing. You can try to use FLATTEN command not at once for the whole drawing, but in parts.