[Qgis-user] How to "Affine Transform" and rotate at a given point

[Jeff Sonnentag]

So basically we have some "engineering" somebody just made up their own coordinate system for that arrived as a DWG and was converted to a DXF in order to get it to appear in QGIS (3.16.5).  At first I thought it was in feet but aligning a corner showed that wasn't right and it wasn't in inches either.

After figuring out and setting a Scale Factor and then re-aligning to a corner things are OK except for a rotation that needs to occur.  It needs to occur around the corner match point.  Is that even possible in QGIS?  It is all built into the transform function/tool in ArcMap so all you have to do is set where X and Y are supposed to come from and their final destination and the rotation occurs around that reference point.  Is there a way to do that in QGIS?

Setting a rotation "around the z-axis" sends things off into the wild blue yonder. . . .
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