Hi,
Better start thinking donor car, though if you find one that's reasonably priced and has all that you need,dump your regular Regal and use IT as a project car. The point is, short of just painting all the trim black, which won't hold up,you are in a catch22 situation. I guess you could powdercoat all the trim, but that stuff is pretty brittle. Anodizing is pretty tough, but all these treatments cost money.Maybe you could buy one of those home powdercoating kits,and shave off a few bucks.Most parts won't fit in your home oven, though.
The part that is easy is the mechanical one.Especially if you have a wrecked donor.My 83 is a recipient of such a swap.It was quite a bit of work,but easily doable,with the donor car right there. All the stuff, wiring harness, fuel tank, rear end,trans and motor,and peripherals,were all there, and stock.I wish I had saved what was left,you could have had a majority of the stuff you are looking for. But this was 9 years ago, before I knew what I had. My buddy, whose driveway it was in,finally had it towed off. Oh well, I got the best stuff, anyway. That donor was the best deal I ever got,at $700, running and driving. It was whacked hard in the passenger side. I probably should have fixed it,in hindsight, but I got a pretty unique ride out of the deal. My 83 is the last of the carbed turbos,black with a different gray interior.Chrome everywhere,but GN header panel and blackout headlight bezels. I have the decklid portion of the spoiler installed,not the end pieces.
The car came with a landau roof,cornering lights,chrome cladding,console,power driver's seat,power windows, locks and trunk,and is the first of the ttypes.It was quite the car, in it's day. It's better, now.
I guess I got carried away,but my basic point is, if you want to turn a regular car into a GN,if you are into cosmetics only,it will cost you. If you want the performance too, it is easy to do,but also pricey. Education is important; immerse yourself in these cars. You won't be sorry. Good luck with your plans.