highend sold such a variety of systems with v1 its not possible to give a definitive answer.

the main points are:
No testing of software is done on old g4's.
catalyst v3 only works with ati video cards. you need at least a radeon 8500 - but they arent sold any more.
you will need to add a second disc internally, using the system disc to do media kills performance.

you might get 2 layers.
its up to you to test.

you have to remember that the mac mini has more ummph than the first g4's that were sold with catalyst.