WOOT!Funny what a small internet this is...
We've been reading the same posts and you do recall correctly about pushing the axle forward by 1.5 inches and extending the radius arms by 12 inches. My plan too.
I appreciate the previous suggestion about buckets from a dana 44 and will be looking into that option.
Also if you find your axle, I know I've some 4.10 gears I won't be needing.
I won't be quick in my build and things began with a center ujoint that resisted a press, torch and liquid wrench, but couldn't argue with my grinder. All and all off to a great start.
Glad I've got company!