Ummm ... you're f-ing fired comes to mind. It ain't like you got to work at this. If you don't know how to figure the sh*t out yourself, there's a whole section on grounding in the NEC. If that ground was actually a ground, the largest wires you could have as feeders would be #2s.
The panel has to be grounded to a ground rod 6 ft deep, it has to be grounded to the foundation steel now, and it has to be grounded to the nearest cold water pipe to the service entrance. Screwed into a piece of wood means that panel is shit if it gets hit. Electricity goes to ground, period. You don't provide it a path, it makes its own.
I'd turn the entire panel off at the service before I'd touch it. And I'll work a hot panel, but not with that Mickey Mouse rig. Did I mention fire the idiot?