2010.12.21 - UPDATE! - I'VE GONE PRO....
Well, I was going to really bust everyone's balls by posting a cool update and linking to a bunch of Photobucket pics that nobody could see until Jan 1st, but instead I decided to upgrade my account to "Pro" and give all of you unlimited bandwidth..... so click to your heart's content, the pics won't be disappearing anymore.

Merry Christmas!
In terms of a real progress update, here's where things are:
Scott has been doing a lot of background work to design a set of adapter plates to couple the Spidertrax 3.5" axletubes to the backing plates of the 404 Mog portals.
There are two different setups, one for the front steer axle (which needs to adapt the inner "C") and a much larger plate which holds the backing plate directly (non-steer rear axle).
The test pieces were cut and sent to me in a USPS flat rate envelope for test fitting. These plates are only about 1/8" thick aluminum, but the real ones will be machined from solid chunks of 1.5" thick steel.
FRONT:
This is the inner C laying on the workbench. The side facing the camera is the axletube side. The Mog part uses 4 large perimeter bolts to fasten the part, and 4 double-rollpins to locate the part and hold it in place....basically just a fancy dowel pin setup. The main thing here is that the bolt holes and alignment holes are perfect, and the centerhole for the axletube is lined up correctly to the axleshaft centerline.
REAR:
This is the backing plate image you guys have seen in previous updates. The upper hole is where the axleshaft enters the portal, and drives the upper gear. This plate is attached with a series of perimeter bolts and has a large opening up top for an oil seal shown in the photo below.
Obviously, the part you can't see on a 1/8" thick template plate is the transition from that large hole to the smaller 3.5" axletube hole to allow it to attach to the axletube. Basically, there will be a step cut in the thicker 1.5" steel plate to allow for those smaller bolt heads to clear, which will still leave a nice, meaty flange to slide over the axletube for welding.
Basically, this first step is just to validate that all the dimensions that were pulled from the stock Mog plates were accurate (not an easy task).... the cost of acquiring 1.5" thick steel plate isn't cheap, and the amount of time these will spend in the CNC getting cut isn't trivial so we'd really like to make sure we aren't going to be wasting our time making expensive doorstops!
P.S. - Shawn, it's about 18 degrees here....when I run the space heater in my garage I'm grateful when it gets the shop as high as 64 degrees!