Mine broke.  So much time and effort it's hardly worth it.  Maybee wood species makes a difference but I tried to use the 4estTrecker method and I wound up piking the bow.  Both sides cracked split and simply broke.  I've seen some realy big recurve tip overlays that were glued on .  I may try that method next.
My radius was the top of a 5 gal bucket for an 11" section that was pretapered.