Building Workout Equipment

I'm thinking about building some basic workout equipment. I'd like to put together a freestanding chin/dip stand. It doesn't actually have to be a combo station but that would be nice. Does anyone have any plans for that or know of a place online where I could find them? It would be easiest for me to build one mostly out of wood but I might be able to get someone to weld one if I could find out exactly how to do it.

Thanks in advance.

Brian

look on the forums of Crossfit.com

also, its very easy to make a dip/pullup station with PVC pipe.

http://www.geocities.com/fightraining/