Hi Josh,
Welcome to ALR. Wooden under-ribs are kinda fun and will save you a few ounces out front versus a solid metal rib. If you want to attach it with pins, then dovetailed underlugs will work, but the base of the lug/dovetail will likely be visible. With staples there might be a problem with the rib sliding back and forth by the width of the staple opening.
As an alternative, if you have sufficient barrel thickness, you could drill and tap the barrel and attach the rib with screws. That's how I did mine.
If your barrel is thin, or you don't want the dovetail notches to show, you could solder the lugs onto the barrel, then pin.
-Ron