If your talking about building a wooden stand in a tree... just make sure to update it often!
I fell through a home made stand 10 years ago. Had 2x6's attatched parrallel to the ground on the outside of the trunks, then plywood accross the middle for the platform. 2 years later I was up in the stand and noticed it seemed a bit rotten already, I no sooner thought that and found myself falling through the middle. Luckily my arms caught the 2x6's and kept me from falling all the way. Had some nasty bruises and scrapes to show for it, but avoided worse.
I have since taken down all wooden stands were I hunt and have started using real ones. And by real ones, I mean Lone Wolf's
Just my 2cents