Whilst there appears to be a stone sarcophagus recipe there appears to be a lack of a corresponding wooden coffin recipe.
Roleplay Significance:
Historically speaking, wooden caskets are cheaper than stone making them more attainable to the common people. Stone burials are more representative of noble / VIP burials. They survive from antiquity where wood does not.
The availability of wooden caskets to the everyday populace is important. It allows non-nobility to respect their dead.
Wooden coffins could offer a portable means of transport for vampire NPC's / PC's. Wooden coffins could serve as phylactery locatons for vampires.