The setup is basically the same, except you might not need the extra Sega power supply if using a Capcom converter. If you turn up the +5v on your power supply all the way (normally 5.8v will be required, some older PSU's may only go upto 5.2v), it will usually work without the Sega power supply, but may cause long term damage, always try to use a separate PSU if you can.
To the average newcomer to the naomi, the copy reads that its OK to attempt to run your Naomi GDRom setup by cranking your +5v WAY out of operating spec. Anybody who owns a naomi, and knows SOMETHING about electronics should realize this is a terrible idea. Doing this is a fast way to ruin your naomi. Please revise before people ruin their systems. Even the GDRom manual says to use the Sun PSU to power it...
So, anyways, if no one feels like writing some copy, I'd be more than happy to revise it.
Cheers,
Bill