Apparently, it was an idea that came about in rscrevolution really really really early in the days.
You remember those places in Falador and Varrock? Where Varrock used to take up the area of the Lumber Mill and parts of Silveria (the area between Varrock and Morytania)?
The Carpentry skill was also a thing, which involved this, and it wouldn't of been until 2006 we finally got Carpentry, which became Construction, into the game.
Considering how RSCRevolution is a hypothetical timeline of if rscrevolution continued development on RSC regardless of RS2, why not add Carpentry into the game?
Now before you start smarting at me saying "OH ADD ALL THE SHIT FROM RS3", hear me out.
Carpentry would be a skill that would benefit RSC players going throughout the world. It so happens that Carpentry could actually be pretty useful in aspects such as resting, restoring prayer, and building things that would help you train your skills like Prayer. Also, having things like dummies to test your max hits could be ideal too.
Oh, and of course, rooms that would show off your achievements, such as a cape hall where you can show off your skill capes, and boss heads that would help show off what you slayed.
Now, how will the POH work? Well, like in rscrevolution now, a teleportation would lead you to an instance where your house would exist. And considering how the Team seems pretty idealistic about adding instances, this could work. There would be 5 portals, one in Eastern Varrock near the fork that leads you out the gate and go either north to the Lumber Yard or south to the mines, Eastern Falador where the houses are (these two areas paying homage to the old POH), one in Rimmington, one in Seers Village, one in Yanille and one in East Ardounge.
I think it would be a great addition for those who want to go and do house parties, and help benefit players whom are maxed, and want to show off their stuff. Or simply, for those who want to train in peace.