My GTS hood has suffered metal fatigue near the passenger side hood hinge mount surface, in front of the hood mount side of the hinge on the sheet metal. Looking into wanting to see if I can find a shop to waterjet some aluminum plates and roll the material if possible at this point, or worst case, get some 1/8" plate and having it bent to match the hood structure. 

Also, if you know of any shops capable, please drop me a message here, email, or message on facebook. 

Not exactly enthused but I'll make something look appropriate at this point.

Would a brace waterjetted and bent to match the hood contour and then you have to drill holes, use a rivnut tool and install compression nuts in a few places be a way to resolve this? Or by drilling holes would I be creating potential failure points?

The thickness of the metal all around that high stress area is the key. If you can make a brace section that extends beyond the critical area, and attach it very well, that should work. If the metal is thick enough, I'd weld it carefully around the perimeter, but only welding very short distances at a time. The support will be stronger if it's welded well, and if the base metal is still thick enough. I've thought of that but long ago figured I'd find a donor hood and make a larger project to use more of it. Making smaller bracing would be faster and easier no doubt.