Well, as the name suggests..
So many people have done mods to make the B&W G3/G4s (And some have done it commendably well! :)) But I wanted to do a mod on a bit older machine.
So I just bought a PowerMac 8500 on eBay. The case is in shoddy condition, but well enough that it'll make the perfect specimen.

Previous Plan:
My idea:
Take a cheap Mac Mini (i.e. 1.42Ghz G4, 512MB RAM, 80GB, Combo Drive.. etc. Possibly a CD Mini if I can find one cheap enough)
Tear out the insides of the PowerMac
Extend the ports to the closest matching the vintage locations on the back of the machine.
Mount an ATX PSU to power the Mini
Wire the front panel to boot the Mini
Mount the Combo drive (Or another drive if necessary) in the same location as the Optical drive in the previous setup.
Make the machine as light as possible by removing unnecessary internal case parts, etc.
Improve Internal Cooling
Mount an external 500GB HD inside the PowerMac and have it powered by the ATX PSU.
Paint the newly refurbished machine to seal the deal.

As far as the Mini itself goes, I can make the PowerMac it's "house" and have somewhat of a dock for it set up, with a cradle and such. OR I can remove everything from the Mini case (And use the case for another mod! :)) and mount the internals in the PM case... I'm undecided.

New Plan:
Okay, so it turns out that the 8500 they sent me, was actually an 8600. Even sweeter deal considering I paid 50$ shipped. Two 5400RPM SCSI 4GB Drives, Plus a 9GB I had a around, CD-Drive (Woooooo. :() and about 400MB of RAM. It doesn't boot on it's own just yet, but with the help of my Mac OS 8 install CD, it's happy.
I ordered a 450Mhz Sonnet G3 upgrade. (Thanks eBay.. 20$!)
While I wait for that, I figured I'll have some fun with the Mach V 250Mhz 604e.
So the plan is.. to superclock the Mach V, with water cooling.
The Mach V was quite a powerful processor in it's time, and even stood against the low level G3s. With this machine having maximum RAM capacity of 1.0GB it's quite a perfect specimen for a basic webserver (Which I'll be needing quite soon) running YDL or SUSE.

Aside from all that, heres my basic reasoning behind this:
I'm getting a 450Mhz G3 to replace it. So if it dies, I lose nothing. (I guess maybe the 20$ I could've resold it for, which I seldom do anyway..My lab is spare parts galore.)
250Mhz has been proven to be a underclocked version of the 604e Mach V. Which means I'm safe overclocking to 350mhz with this card. The main problem I can see is voltage supplied to the chip is most likely lower on the 250mhz to save power and processor life/heat production. But with water cooling and improvements, as well as a bit of voltage probing..It could really go for the long haul. While I realize that 250Mhz could easily have a different chip/board structure, since it is after all the second lowest model.. But it won't stop me from trying. And like I said.. There is slim-to-none chance of losing something.

Will it be worth the work? Who knows. I love modding, especially breathing new life into old machines. My Color Classic Mystic and PowerBook 540c Server are proof of that. laugh (Besides, What would an 11 year old machine be with water cooling? Extremely badass. Thats what.)

(Update 3/13/08: Machine is up and running Mac OS 9.1 off of one of the 4GB HDs. Test indicated that 4 RAM Sticks are bad as the machine will not boot with any of the 4 within it. I suppose thats why it was so cheap. Anyway, thats still 512MB RAM. Not too bad. And crazily enough, with 512 RAM Mac OS 8 says there isn't enough system memory to open Finder. Scary.)

(Update 3/15/08: Ordered 2x 512 (8 128MB Sticks) From eBay for under 25$ and snagged a 10.8GB Fast SCSI HD for 20$. I figure with a software RAID it should provide enough storage for usefulness. Looking into a 600W ATX PSU conversion. Probing the motherboard to see if it's possible.)

(Update 3/17/08: Just did some research and found out there is a 1.0Ghz G4 upgrade for this puppy. There may not be a need for water cooling overclock after all. And it would be cheaper, but I lose bragging rights. I'm torn here. Also, the 1.0Ghz will probably be crippled on the 50Mhz System Bus anyway. We'll see.)

(Update 3/28/08: Well, the G3 upgrade arrived in the mail. And while the speed difference to the 604e is noticeable, it's overclocking capabilities are very limited due to the design. So this may be mainly just a restoration project instead of an insane hardware mod. More research will yield results. Testing continues tonight.)

Basically, this project has depreciated in the priorities. I just started a new job, and really don't have very much time. The low priority of it, is going to turn it into a low-class Linux server. I'll post anything if it ends up changing, but it shouldn't for a long time. (7/21/08)

Edited by (07/21/08 04:52 PM)