I am looking to create my own cheap stand up desk. My current idea is to take one of the cheap $40 6 foot tables where the legs fold up and buy 4 plastic crates to put on the corners of the desk which will hold a piece of wood the same size as the desk or a little larger.
Is this a good design? One of my concerns is there is no center support on these tables that have folding legs, all in all I don't think the top porting of the desk would ever have more than 100 lbs on it at a time (although I have no idea how much the wood itself would weigh)
Another related question, how can you determine a good relative stand up height to your own body height?
Update, some great suggestions so far, however I want to keep the project to under $100