I build tower or penthouse stands in all sizes. i like the steel cause it lasts a long time if you will just keep paint on them.
I make the sides and of course the floor out of wood but make sure to paint them also to make sure they last.

If you weld or know someone who welds you can build them pretty reasonable. it costs me about $120 to finish one from start to finish depend on what materials i use . i have two in my field now ready to be put out or sold. one of them may actually be sold .

I used to use wood stands but they just don't last like the steel does.