[G4] Adding Drives to G4 AGP Graphics Model

[shopdog at mac.com]

Dear List Members:

Does anyone know how many internal hard drives I can add to an AGP  
Graphics G4 model, and how I would go about doing that?

I have added one drive (on top of the included drive), and there  
seems to be room for at least two more, but I'm not sure how to add  
more.  Where do I get brackets?  Where do I attach the brackets?  Is  
there enough power supplied by the power supply?  Will the fan cool  
the drives adequately?

Thanks for any help...

shopdog