Kind of a late bump but $449 from lethal performance? I don't know if I'm looking at the right one but did they raise the price $250 in the past months, all I see is one for $699.
foreprecision,
First, great job on the diff cover. It looks very strong.
Now about the mount. Why not just do a little design change and incorporate the rear mount right into the cover like I did.
About the discharge of fluid, have you tried to shroud the vent hole like the factory cover?