Anyone know a good way to blank them out and renumber them?
A couple of threads for you to look at
http://www.trainboard.com/grapevine/showthread.php?135056-Scale-Replicas-Numberboard-stickers&highlight=number+boards
http://www.trainboard.com/grapevine/showthread.php?124225-Question-about-number-boards&highlight=number+boards
ratled
Modeling the Klamath River area in HO on a proto-lanced sub of the SP “The State of Jefferson Line”