i honestly dont understand how u could have trouble finding the svp files as they are all linked on here numerous times.. the file is called svpcomplete.sit for 4.5.1 and there a 4.2.x installer - as far as i know they are both fixed + require no floppy authorization.
All the sites I've gone to either 404 out, or deliver a bad DL. There is just so little SV love out there these days. I did try to log into the Yahoo group, but it forgot my user name--I sent them a post last night, and I have yet to hear from them.
But it's cool. I had it on a hard drive on another machine.

I think I have a PS issue. If I turn off the machine for any amount of time the power button wont turn it on without unplugging the power cord. However, if I do a forced shutdown from the power button, and then start right away it comes on. This was a known condition of the FW800 machine I bought (and why I also got the MDD).
Just do a PMU reset - the button is inside the mdd case door toward the bottom of the case door. Read the article here on how to;
https://support.apple.com/en-us/HT1939
Oh cool I'll give that a shot.

Thanks Jakl
While it's been a slow posting day for me I've made some decent progress.
I have the mix system installed in the FW800. SV 4.51 is running on it, and seeing plugins and what not. That one is going pretty well.

I had to remove PT 5.3.1 and install 5.1.3 instead in order to get it to work with the Mix system. As per the Digi docs
Pro Tools|24 MIX
Pro Tools 6.4.1 is the last release that supports MIX hardware.
Pro Tools 6.4.1 for Mac OS X 10.3
Pro Tools 6.4.1 for Windows XP
Pro Tools 6.1 for Mac OS X 10.2
Pro Tools 6.1 for Windows XP
Pro Tools 5.3.1 for Windows XP/2000
Pro Tools 5.1.3 for Mac OS 9
Pro Tools|24
Pro Tools 6.1 for Mac OS X
Pro Tools 6.1 for Windows XP
Pro Tools 5.3.1 for Windows XP/2000
Pro Tools 5.1.3 for Mac OS 9
If I try to run DP3.11 on it DAE gets confused and I have to reboot. I'm not sure why this is--I'll have to investigate this later.
I did learn something interesting though. While the HD rig was qualified for OS9, and thus DP3.11 it didn't include the Accel systems.
http://archive.digidesign.com/compato/os9/hd/http://archive.digidesign.com/compato/Non-Accel Pro Tools|HD Systems Only
Pro Tools 6.1 for Mac OS X 10.2
Pro Tools 6.1 for Windows XP
Pro Tools 5.3.3 for Windows XP
Pro Tools 5.3.1 for Mac OS 9
This probably explains why Digi test only saw the core card, but not the accel cards.
In the G5 I have the HD3 Accel system installed. DP 4.61 on Panther 10.3.9, with PT 6.4.1. This is sort of working. I think that maybe I have the cards in the wrong order, or the flex cables.
PT10 wont install on the G5.

Had to give it a try since I had it around.
It's looking like around V7 of DP is going to be it for the G5 trying to run DAE.
http://www.motu.com/techsupport/technotes/digital-performer-dae-mode-compatibilityBut it also looks like Tiger (10.4) is Digi's limit for the PPC and PT.
Pro Tools|HD Accel & Pro Tools|HD Systems
Pro Tools HD 7.0/7.1 for Mac OS X 10.4 for PPC-based Macs
I currently have Leopard (10.5) on one of the boot drives, and that doesn't seem to be working, although Panther (10.3) does seem to be doing better. Another bummer about Leopard--it doesn't file share with OS9!
Anyway it looks like I'm going to have to get the Tiger installer out, and make an Audio System boot drive with it for the G5. I was hoping to at least get to Leopard (10.5) with it, but it doesn't look like PT supported any PPC action for the HD beyond Tiger (10.4)
Currently the Core card is in the slot closet to the video card, but digi test is calling this slot two, with the Accel cards in slot one, and zero. So I'm going to try moving them around to see if it that works.