You certainly could use CNC machines to make a front fork. It maybe seems a bit like using a hammer to open peanuts- effective but perhaps excessive.
The easy way to improve a fork would be to cut apart the damper tubes and replace them with telescoping brass or aluminum tubing. Replace the bottom ends with the kit parts.
Obviously you can use your own turned parts in place of the tubing, and you can get more advanced and complicated from there. The whole front end (or even the whole bike!) can be replaced with machined metal- it depends only on your ambition and skill.
If you can show us pics of the actual fork and the kit parts you have to work with, we can probably give more useful suggestions.