wigs, I wondered the same thing, but w/o detail work, these could be constructed
closer to delivery date. Usually, the whole fondant/crusted royal icing over soaked cake that has been sealed first with almond paste is to ensure the cake can be decorated over a period of days--and still stay fresh. These just need a good dollop of icing between the layers and decorations. No detailed piping, etc.
They are gorgeous!