Have you seen the original 3rd axis mount for the BPT EZTRAK. They mounted a 1/2 inch steel plate between the head and the knuckel. To this they mounted the motor, right angle gear drive, ball screw and a arm that moved the quill up and down from the quill nose. It was a terrible design. I know of a few shops that have thrown them out. If I get a chance to convert one of the few remaining onees to the better ELROD design, I will post it here. It may be free except for shipping. As for the cost of a new conversion, do the math. What would it cost YOU to design, build, modify design many times, modify old build or build new design, then market a unit. Remember that if you have a company, this includes salaries, taxes and benefits. Maybe the price is not that high. Microsoft employe 28,000 people on 355 acres. Cost of this is devided over the quantity of units of software sold.