Hi all,
After a long, drawn out battle with the US Post Office who sent me an apology note for destroying (no details on what they did with it, just that they were very, very sorry) the first package, my 5v Radeon 9200 256MB card arrived from Elbox.
Before I go any further, let me thank Elbox support for answering my numerous emails because I'm too dumb to set the jumpers correctly on my Mediator logic card which resulted in all sorts of initial confusion, gurus and head-banging.

The final driver update package has not yet been released, so the necessary files need to be manually dragged/copied into place.
What's in the box? Right now, just the Radeon card and some bubble wrap. The new files can be downloaded from Elbox.
First, configure your Mediator logic board. In my case, that's the A4000D board. Set the following jumpers:
MASTER: CLOSED
WINSIZE: CLOSED
SWAP CONFIG: OPEN
Install your RTG software, in my case I used P96 v2.1c, and choose the "Cybervision 643D" option as your graphics card.
Look in your Sys:dev/monitors for the Cybervision monitor driver and rename it "Radeon", then go into the information and change the "BOARDTYPE" to equal "Radeon".
Re-run your P96 install and select "update an installed version" and select only "monitor setting". Select the maximum supported rate for the monitor you're planning on using.
Manually copy the new PCI.libray file into sys:libs.
Manually copy the Radeon.card file into sys:libs/picasso96
Create a text file containing 2 characters (the amount of memory you wish to reserve for the Mediator - I used "32" for 32MB) and call it "RadeonMem". Place this file in your envarc:mediator directory. This will cause your remaining Radeon memory to be added to your available system memory.
Reboot and open your Picasso 96 preferences, select "attach settings" option and choose the available "Board0:Radeon" option. Adjust your screen modes to your heart's content and SAVE the settings. I'm still tweaking the various available modes to remain within the range of my monitor, so make sure you TEST each one before you go to the Workbench ScreenMode Prefs and save one of the Radeon modes to use on boot up.
I have a ViewSonic VA2223wm monitor (link:
http://www.viewsonic.com/products/desktop-monitors/lcd/value-series/va2223wm.htm ). I've connected my IndivisionAGA to the VGA input and the Radeon's DVI output to the monitor's DVI input. My manual monitor switcher box is now on a shelf.
If only one video source (native or RTG) is active then the monitor will automatically switch to it. If both are active (say I run SysInfo from my Radeon Workbench) then I press the input select button on the front of the monitor to switch screens. Exiting SysInfo closes the available native screen and the display automatically switches back to the Radeon.
The display is crystal clear and Workbench feels very snappy indeed.
With my Workbench up and running (Classic AGA) with the various utilities and patches in the background, I have the following memory free:
2,031,424 Graphics Mem
308,218,880 Other Mem
this is made up from my 2MB Chip RAM, 16MB RAM on motherboard, 64MB RAM on Warp Engine CPU Card and the remainder from the Radeon.
All in all, this is an excellent solution for those who want a single monitor setup with no switcher-box and some extra RAM thrown in for good measure. Nice one Elbox.