Firstly, it we be arrogant of me to "prove" the suitability, considering that it is my subjective opinion.
Why a G4? And why a MDD? I explained that I need to run OS 9, and a maximized MDD G4 is the fastest, most recent OS 9 system there is - and will likely ever be. If I knew how to hack Apple ROMs to run on newer PPCs I would do it, but it is not possible. Also such a box is quite good for running 10.4 as well.
This would naturally lead to the question of why I need OS 9... I use my favorite tools, regardless of what era they are from. Rather than being the guy who threw his PPC in the garbage an ten years later whines on some BBS how lame it is that he can't use Hyperprism anymore. Every system I have has peripherals and software which don't exist on any other platform. Do people trade in their old computer like a car, for a big discount? None that I know. So there is no reason to not enjoy running ones favorite applications natively, unless one is pressed for space.
And if you mean proof as in links to my media, there aren't any anymore. Either that, or I am a bullshit artist, your call! I retired from my noisy musics before my son was born six years ago, and am now trying to get started again. There have been creative fits in the meanwhile, but mostly synth building and screwing around with Max/MSP/NATO on occasion. The circles I ran in have moved on, so there are no tracks nor clips online which I am aware of. Also my output came off as a novelty to many, who couldn't tell one of my jams from another, so I don't really care about distributing my work anymore. To compound the heresy I usually did computer improvisations, and rarely ever recorded them.