A gilded bench 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 Gilded bench, this requires 61 Construction, uses 4 mahogany planks, 4 gold leaves, and gives 1760 experience. The flatpack can then be used on a dining table hotspot in a Dining room or Throne room, either in building mode or not. This requires no Construction level and gives no experience.
The cost of making and selling a gilded bench flatpack from scratch gives a profit of: -462,715
After completing the hard Fremennik achievements, hey can also be traded to Advisor Ghrim in exchange for 52,270 coins being added to your kingdom's coffers in Miscellania. See Flatpack: Miscellania reselling for details.