Will be post holiday before I get remaining fans and what not in for small remaining work, be gentle on it's appearance (loose cables are normally not loose or seen as some are not even plugged in right now).
(typing, and realize I forgot or don't know how to reference attached images so sorry please see file attached).
2-block.jpg and 1-overallf.jpg
Early fit info basically for you.. This is with a corsair H80. Top part of waterblock/pump/controls removed and internal 3 ping connectors (for power and controller) extended to put controller elsewhere. If you don't remove it, the block/pump/controller will be crushed by the radiator and the door won't close. The Corsair H80i's lower profile block should fit without modification, but you loose the simple 3 speed push botton control (only controlled by corsair usb link or whatever they call it). Disregard the zip ties around the for posts/mounting-pins/bolts. Could easily get a thin acrylic sheet with holes on top to deal with holding them straighter if needed, but really needed the water block fits very tight between the 1.25/1.33/1.42 dual processor 4 hole pattern around the dual cores. Note, this will not work for anything without that whole pattern on the cpu module (which means, pretty much dual processor modules only from what I have seen).
Control module is on top of 120 mm standard Corsair H80 radiator and 2 included 120 mm fans. 3 built in speed settings. Lowest easily keeps the dual 1.42 under the waterblock cold under max load. Control module could really be anywhere I guess. Works there in case I want to access it quick by opening the door.
"3-front facing.jpg" and "4-between 120 and 120.jpg"
Quick look of radiator spacing and replacement Cooler Master 120 mm fan (optional, provides a bit steadier fan speed from the coolermaster fans on the radiator as it helps provide (in combo with a pair of 80x80x10 mm fans way up front in front of drive cage) a nice quiet steady flow of air. Had wired them into the onboard fan header (may return there if the motherboard speeds up the replacement 60mm fan I have on the way for the dvd/cd drive too much with no load on the normal 120 mm cpu fan header). But at max rpm of 2000 RPM the cooler master 120 mm fan is nice and quiet. Video card is easily louder yet.
"2-upper psu area.jpg" and "5-2.5hdmount.jpg"
3m 2 side taped a very simple 2.5 dual drive mount to the top of the cd/dvd sub-chassis. Comes out with the cd/dvd chassis without interference. I wanted a couple more drive bays back from loss due to radiator position. Earlier images, you will see similar adaptation to the original 3.5 mount brack under the cd/dvd sub-chassis. Went with nice 2.5 inch 7200 RPM sata drives and 2.5 inch sata ssds. Small size of modern mechanicals might as well be taken advantage of as well right? Well.. I don't need any super 1tb/2tb/3tb/4tb/6tb range 3.5 inch drives right now anyway. But they would fit in lower bays if needed.
Other notable points in images, the FSP 450 watt micro atx power supply and simple little mod of a power cord (cut off, shortended and soldered to a simple socket). Power supply is 3m double side taped in. It will come off any day I want it off hard enough, but it isn't coming loose and fits perfectly in the depth of the original power supply (actually, it is a little thinner). Fan in it is controlled by PSU. 4 drives, Geforce 4 TI4600 or Geforce 7800 C (one or other, but either), water cooling, 2x burners, all fans.... the Fan barely turns on. Well over need of hardware in the mac, but it allows the power supply to run at lower output levels (less heat, less to cool). Silverstone makes a version of almost identical powersupply (same oem from what I have read), but atx 24 pin cable is quite a bit shorter and will make it tricky to reach the motherboard with or without your own custom adapter.
Little support bracket is taken out under power supply, but was not needed to fit anything in the case (does clear a spot for the h20 cooler controls though
).
So..
Parts list minus hardware to mount water block/pump.
Corsair H80 water cooler all in one kit. (you find via google, not H80i will also likely be fine)
ATX adapter from:
http://atxg4.com/mdd.html Note, I added one more pin so onboard firewire would be powered (vs unpowered and requiring external power for firewire devices.. wire is one left out by most people as it is for 25v normally used for Apple ADC).
450 watt FSP Micro ATX power supply (really, any micro atx should fit wonderfully.. take your pic but remember it is a long way to reach the motherboard).
http://www.amazon.com/gp/product/B005CP07PQ/ref=ox_sc_sfl_title_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DERIEC 60320 C14 Socket (for power supply)
There are several sources/brands for this type of part. This one comes with screws etc that could be used to affix this after simply sliding it in from the back of the MDD G4 case. I did that and essentially epoxied (high temp hot glue) on the inside to hold it in when you pull the external power cable out of the socket. Design of socket makes it so you can't push it into the case. Make sure you are comfortable with soldering/electronics if you do this approach as I do not support/suggest-this/etc (don't take my word on this.. went to school for electrnonics amongst other things but I am not saying this as certified electrician or anything of that sort. That is my public statement for today on this.).
http://www.amazon.com/gp/product/B00917Z96S/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DERIf you don't want to extend the internal connections in the water-block/pump/control setup.. You can get a 2 pin and a 3 pin fan extension cable from various sources.
I know, I left out mounting method. Will see if I can pick up a second set of misc bolts, take pics and show I I crafted a mounting method/clamp for this as soon as I can get to hardware store and commit to building the second setup like this for the FW800 (currently this is all in my FW400 board/case combo).