This is probably one of the GUI's with the most rendered triangles ever in Minecraft :-)

OOI is the scan done once and locked, or is it updated periodically?

The scan is locked by the scanner. However, sending the data to the client has to be done again if it was some time ago

Oooh, so you could set up several to show a build over time?

Um? Not sure I get what you mean?

So you build a scanner, scan an area -> "before", then you build stuff, a second scanner, scan area -> "after"