I have decided to give this a shot. I have ordered most of the parts & knew the cost would be a bit more than he says. I am up to $63 in parts except for the metric nuts, bolts & alum. extrusion. I will probably not start working on putting this together for another month. Maybe by then their will be better instructions on how to put this all together. I ordered some parts from Amazon & some from ebay. The nano board I opted for one that had all the pins soldered which only boosted the cost by $10.

http://www.thingiverse.com/thing:702470

Here are the links to the parts I ordered if anyone has an interest in these. Some of these may have changed price since I bought them.
$14.99 Lucksender ATmega328P Nano V3 Controller http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
$3.40 Uln2003 Stepper Motor Drive driver stepper motor controllers 5V 4-phase 5 line http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
$14.93 5pcs 650nm 5mW Red Laser Line Module Focus Adjustable Laser Head 5V http://www.ebay.com/itm/251688838898
$9.99 Hercules 4780733 HD Twist Mini Webcam - Turquoise Blue Edition http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
$6.92 10 624zz 4x13x5 bearings http://www.ebay.com/itm/10-Bearing-6...item35cf4c9850

-David