[asid61]

As somebody who has used the mill continually for 4 years: send those parts out! I have learned many more things pertinent to my Mechanical Eng. major through CAD than through the hours I've put in on the mill, and if you have the resources I would highly recommend going with waterjetted parts.
The CAD isn't going to make itself, and the robot still needs to be assembled, tested, and reiterated afterwards.
Just wondering, have you talked with your kids about the choice?