I got inspired by this post:
http://forum.insanelymac.com/index.php?sho...p;p=864044&
to do a conversion of an old G4 i have standing. What surprised me about !Shaun!'s build is that it seems he's got room for all of the I/O-ports *without* losing any expansion slots. 

He's doing the mod in a Quicksilver case. This has, to the best of my knowledge, 5 expansion ports. The Yikes/Sawtooth case has a bigger IO-panel and only 4.

-Does this mean that I can mount my card a little lower than !Shaun! or would I lose an expansion port/some IO ports?
-If I can mount it lower, would I avoid some of the space-issues regarding clearance around the DVD?

I'll be using these parts:
-Asus P5Q-EM/Asus P5QL-EM
-4GB Ballistixx DDR2-6400 (CAS 4)
-PowerColor Radeon HD4670 (in a while)
-a silent but efficient CPU cooler
-3-4 120/140mm MIST low-noise fans

I already have:
-The G4 Yikes! Case
-Seagate 7200.10 750GB PATA

Now to power this baby I'm thinking about a modular solution (less clutter):
-Antec NeoPower 420 HE 

The choice of this PSU is based on my preferences of:
-low noise
-expandability (more drives in particular)
-steady voltages (for OC'ing)
-placement of connection and powerswitch
-fan arrangement

I want to turn this G4 into a quiet powerhouse. An important component in doing this is a low-noise PSU. It is important that the PSU has an in-line venting arrangement. Some newer designs use a side-mounted fan of a larger diameter (often 120mm) This one uses a rear-mounted 80mm. The thermal design of the G4 case uses this kind of airflow by default (Mac PSU). The newer design *would* be OK (maybe even great) if it sucked from the topside (when placed horisontally) and had the connections on the left hand side. However most PSUs using this design have the connections on the right hand side, bummer. The Antec PSU is a good performer and supposedly very quiet. It is a Fortron-Source design reworked by Antec.

I'll run the CPU stock or mildly overclocked to begin with (maybe 2.8GHz) but I'd like to have a go at 3+GHz. Also I'd like the opportunity to chuck in a better GPU later.

What do you guys think? Any help/pointers would be greatly appreciated.

I used an Acbel: API4FS06. its 550w and it comes with tons of connections. It lines up perfectly with the cutouts on a g4 case aswell. The only thing is that it isn't super quiet so swapped the stock fan with a quieter enermax and ive never had any problems with it. Good luck.

I make the same case mod but with an ATX mobo...the big probleme is the I/O shield and the PSU, if you keep the same configuration for the psu (on the back panel) you have to install a low profile radiator for the cpu. The intel heatsink seems to be good (and silent) but you can choose the scythe shuriken (6,6cm height).
If you mount your mobo lower, you will lost usb port or something else and the bottom of modo will touch the chassis and opening system...
sorry for expression i'm french

http://www.aqua-mac.com/
he has done a ton of conversions build orginal macs and hacks
even has a forum for questions

On my conversion, I placed the power supply in an alternate spot that I haven't seen anyone else use. Instead of placing it in the original location, I put it in the bottom left corner underneath the CD drive bay. The PSU was the type with a 120mm fan on the top, so I cut a rectangle out of the sheet metal of the side of the case for air intake/wiring and then screwed the power supply in place. I wired the power connector to a separate plug epoxied to the original PSU location in the back of the case.

The advantage of doing this is that you can use a full size tower heatsink for maximum CPU cooling along with another case fan mounted where the power supply used to be. You have the normal push-pull case airflow and none of your expansion slots are blocked off.

yeah good idea..you have photos?Or is that you on console hack?
http://console-hacks.com/modules.php?name=Encyclopedia