Description

Quest Building Your Own Coffin is marked as available on the map but not actually available. Another quest - Mass Production - must be completed before Building Your Own Coffin can be started.

https://www.wowhead.com/cata/quest=13977/mass-production
https://www.wowhead.com/cata/quest=13983/building-your-own-coffin

Wowhead link

Screenshots

Questie & WoW version

Cata Classic
Questie 10.3.7