The instructions at
http://www.leevalley.com/wood/page.asp?page=32777 use a
paper template to mark the hole locations with an awl. This method would allow
you to easily construct any board layout, any size you desire. Drill bits in
x/64" sizes are available from
http://woodworker.com/. I think a sharp brad
point bit would make clean holes...
JeffB