OK... here it is FINALLY.
Stock hood hinge:
The parts I used to install the brackets are:
4 - 8mm x 1.25 x 30mm studs- full thread
4 - 1" OD x 5/16" ID stainless steel flat washers
4 - 5/16" hardened steel flat washers
4 - 6mm x 1.00 nuts
drilled and tapped to 8mm x 1.25
4 - 8mm x 1.25 nuts
Basically, the secret is to NEVER REMOVE MORE THAN ONE HINGE BOLT AT A TIME.
First step is to cut the plastic.
Next, loosen and remove the front hinge bolt. Install one of the studs into the hole where you just removed the bolt. Leave enough threads sticking up to install the bracket. Put one of the SS flat washers on the stud. Now take one of the 6mm nuts (10mm wrench) that you drilled out and tapped to 8mm x 1.25 and tighten. It doesn't have to be super tight, but you want it fairly tight so when you remove the rear hinge bolt, nothing moves.
One thing... you want the flats of the nut to be more or less parallel with the edge of the hinge when you are done tightening. This is so the slots in the bracket will fit over the nuts.
Pic showing the front stud installed:
Do the same to the rear stud. (Hint: closing the hood and working through the notch you cut in the plastic is the easiest way I found) Again, line up the flats on the nut so they are parallel to the edge of the hinge.
Pic showing both studs installed:
Now if you close the hood about halfway and turn the bracket on its side (light mounting tab down), you can slide the bracket in from the windshield side, twist, and drop it over the studs.
Drop a couple of hardened flat washers over the studs, install the standard 8mm nuts, and tighten. Note that the 6mm nuts you drilled out to 8mm fit into the slots in the bracket... if they don't, you need to turn them slightly so the flats line up in the bracket slots.
Done.
Two installs using this method... no issues... both of us have had the brackets off and on a couple of times... takes less than 5 minutes per side.
One note...the "homemade" nuts only need to hold the hood bracket until the light bracket is installed and tightened. Once the bracket is installed, it clamps everything together very well. There should never be any problems. But use this method at your own risk...
(If I were starting from scratch, I'd do it differently and there would be no need to rethread the 6mm nuts.)