A mahogany table flatpack can be made at a workbench (Steel framed bench or better) in the workshop of a player-owned house. This requires 52 Construction, uses 6 mahogany planks, and gives 840 experience. The flatpack can then be used on the table hotspot in the Dining room while in building mode. This requires no Construction level and gives no experience.
The cost of making and selling a mahogany table flatpack from scratch gives a profit of: -8,397
After completing the hard Fremennik Tasks, they can also be traded to Advisor Ghrim in exchange for 1013 coins being added to your kingdom's coffers in Miscellania. See Flatpack: Miscellania reselling for details.