For a while I was building individual stands for amps over preamps, that kind of use
https://www.audiogon.com/systems/9703
I checked discarded furniture, along the side of the road, or thrift stores, just to see if the top was solid hardwood. Keep a heavy hammer in the car: if it won’t fit in your car easily, beat the bottom to pieces and take the hardwood top home.
For my stands, even drawer fronts were big enough for the side pieces.
My woodworker would plane it and I would take it from there. Mahogany, Walnut, I don’t care much for Oak, but there is a lot of it around.
i.e. you might find a decent size piece of furniture in a thrift store with a quality top, then build whatever under it.

