Instead of re-layouting each time, wouldn't it be easier to have the mwb file available and just update the model from a live database / schema and layout the changes?
Topic on Manual talk:Database layout/diagram instructions
I see them stored in https://github.com/Krinkle/toolserver-misc/tree/master/public_html/mwDatabaseSchema/
So in Workbench, one could try Database -> Synchronize Model to avoid some work, maybe.
I've found it quicker to redo it then to do it this way. But anyone taking this on should feel free to re-use my files as they see fit. If and when someone does this, I'd be happy to keep publishing them in that same directory for discoverability.
FYI: Note that Doc Taxon has volunteered to try the next one.