SkiFreak
Crazy Person
One notable difference between the FE and FG is that the FG has a stepped chassis. This allows the front to be higher, to give clearance for the diff.I am interested in any links you might have to a FE 4X4 conversion as those do seem reasonable to find.
If you lift the front of an FE, you would also have to lower the rear suspension (maybe using spacer blocks on the springs, like on the Isuzu NPS) in order to keep the chassis parallel to the ground.
The front diff on an FG sits pretty much directly under the sump (the sump pan is also different on the FG), but if you were doing a FE conversion, getting a diif where the pumpin was offset more could make the task easier.