Our home remodeling project has required a new wall.
While this sounds daunting, building a wall has been one of the easier tasks in which I've engaged. Nail a few studs (2" x 4" wood boards) together and you have a wall. Make sure they're level and square, of course. Hang the Sheetrock (or other wall covering) and no one can tell the difference between your wall and the pro's.
Before I hung Sheetrock (gypsum board panels--it's what most interior walls are covered with rather than wood paneling anymore), I wrapped a signed copy of Loathsome, Dark and Deep in a plastic bag and stuffed it between two studs. Maybe in another fifty years someone will tear down my wall and wonder at the little book. Maybe they'll read it. Maybe they'll simply dynamite the place and never find it. My wife thought I was crazy.
I thought the idea was kind of fun. Besides... I've been a little disappointed at not finding any treasure as I've demolished our house. I wouldn't want to rob a future home re-modeler of the joy.