How to still get an unrotatable block rotated. :
# **Mirror cubes + XY-plane**
## Pick something like a hull cube
## Put a blue symmetry wall down (XY-plane)
## Enable "mirror cubes"
## Place the hull down and check rotations, the block on the other side of the symmetry wall should be rotated and have "BACK" as rotation.
## The other 2 symmetry ones are fine
# **Template rotation**
## Put a hull cube down
## Take a template of it
## Load the template, rotate it and place it down
## Block should have been rotated.