If you have not found a source for the Hood Adjuster hardware for the core support. Factory, there was a nut resistance welded to the core support in those holes. Here is what you can use in their place. I believe the threaded part is 5/16-18 thread, but check to make sure.
Here are plain steel ones, Check your dimensions of the hole size to order the correct ones.
https://www.mcmaster.com/#clip-on-nuts/=1d4ysrk
They also have stainless steel versions, but only in two sizes, I don't think are the correct size...
https://www.mcmaster.com/#clip-on-nuts/=1d4yv3l
The rest of your build looks great. I like the why you did the headlight bezels.