Bob, 

$1k total. The maslow itself with depth control (you need this, it makes things much easier) about $500. You build a frame to mount the motors on (1 piece 3/4 ply and 2x4) $70. The good router about $150. There are some other odds and ends but the improvements came from modifying the frame and how the chains hang on the motors. The 1st iteration was erratic getting within 8 inches of the edges of the 4x8 plywood sheet (you have one chain almost all the way in and the other all the way out). Another improvement was how the sled is attached to the chains. The old one was prone to "flips" at the edges. The rest of it was computer coding. The calibration is much easier and more accurate than the original. When you have 5000 guys who blew $500 on the kickstarter (with their wives saying "I told you it wouldn't work!) eventually things get better.

Jerry