I recently found this old coding project which I created while playing this game when it originally came out.

Here is the skill calculator website:
Skill Calculator[fania.github.io]

It looks like this:

You can share skill trees with friends via the url:

share-url[fania.github.io]

The code is on GitHub[github.com] if anybody is interested, but it's just a fun project, so don't look to hard at the code please, lol :D

Have fun!