I think you're good using the mentioned bumper bracket mount locations and not using any door bar, assuming it's not a convertible car. My 'cuda has been just fine using the same method, but if you're worried or just want a little overkill, add some bars to keep it more rigid. Just my opinion
You have a month to get this together. I wish you luck but I'm not so sure it could be done, but perhaps I'm wrong. I will check with my contact and inquire if he is interested in helping you.
I can speak for Cole's 3D printed fender tags. Buy one (he will reproduce the correct tag if you have some documentation) and display it without the worry of someone taking it. Correct? Nope....but the cost is low and you will be supporting a Mopar enthusiast.
Mine isn't 100% accurate, but is a...
Walmart batteries in my A-bodies as suggested by many. Converted to appear as a factory battery with the cap/decal dress up kit. Will do the same with the 'cuda