Yes, such a project would be useful. I suggest you get in contact with
some of the people already running something similar, e.g.:
http://garmin.na1400.info/routable.php
That project has selectable maps, a mapsource installer and more.
Presumably it could use some programming help to perhaps make custom
maps.
There's also style support in mkgmap, but I don't know of any nice UI
for setting those styles. Something neat for that would be nice, and
could be used by such a project.
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