You've done a really nice job. Great to see its a "family job". I like your use of the hood. The sight line over the hood of a G is awesome and you can have a lot of gear up there with no impaired visibility - just keep the tall stuff closer to the windshield? Many Expo folks tend to load up their roofs, cargo area and rear door/bumper and end up very heavy on the rear axle - hood racks make a lot of sense and I'm sure well be seeing more of them. And it can be used for gathering firewood when your a mile from camp - most established sites have been pretty well cleaned out.
Secure the gear well, like you've done, and its no riskier than carrying it anywhere else.
Again, nicely done.