Something to use was found based on this:

https://gis.stackexchange.com/questions/322262/rotating-shape-around-defined-point-instead-of-centroid-in-qgis

It's handy to know you can hold CTRL and click to set the point rotation occurs 
around.


From: Qgis-user <qgis-user-boun...@lists.osgeo.org> On Behalf Of Jeff Sonnentag
Sent: Friday, April 9, 2021 10:21 AM
To: qgis-user <qgis-user@lists.osgeo.org>
Subject: [Qgis-user] How to "Affine Transform" and rotate at a given point

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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