I’m actually working on an update to better visualize the matrix. My current released version indicate row-major order. But SketchUp uses column-major order.
New version is currently looking like this:
Color coding for the rotation axes, along with their angles described in degrees.
Note that the translation values are now located to the right, not the bottom. Hovering over a matrix will display what index it relates to.
WIP is is the dev/column-major branch:
https://github.com/thomthom/transformation-inspector/tree/dev/column-major