I want to put together a contraption that will allow me to do pullups/chinups in my garage. I would appreciate information from individuals who have experience on affordable yet effective ways on building such a device. Of course, I am attempting to avoid buying something pre-fabricated to reduce cost. The best option might be to just 'buy it'. I can accept that, but would like to consider alternatives. FYI, I almost 6' 5". So hanging from a doorway will not suffice. My knees either touch, or almost touch the ground with most home gym things I try. I find that I spend much of my energy trying to keep from touching the ground and F'ing up my flow on such objects. Thanks.