An Opulent table flatpack can be made at a workbench (Bench with vice or better) in the workshop of a player-owned house.
Like when making the normal Opulent table, this requires 72 Construction, uses 6 mahogany planks, 4 bolts of cloth, 4 gold leaves, 2 marble blocks and gives 3100 experience. The flatpack can then be used on a dining table hotspot in a Dining room.