I had to laugh when I read your story--I know it's not funny, but you do have a way with words. We've all been there, but speaking for myself, I've never had as many problems as you with a build, or had the possessed model turn out so well. That's a great looking Plymouth!!
If you're driving between Salt Lake and Denver, and you pass through Grand Junction, Colorado on Interstate 70, stop at Hobby Hut Models on N. 12th St. in GJ. I used to go there as often as I could when I lived near Grand Junction, and recommend it highly. Great selection of most everything!
To eliminate a seller from your eBay results, find the blue box that says "search" at the top right of the page, and click the word "advanced" that is to the right of that, in smaller letters. That takes you to a new page where you can customize your searches. Drop to the bottom of that page, to the section that's titled "sellers", Click the box that says "only show items from",click the "specific sellers" button, then hit the arrow to the right of "include", highlight "exclude" from the drop down results (the only other choice given), then type in the name of the seller you want to exclude in the box to the right. Last step is to click "search" at the bottom of the advanced page. If all goes according to plan, in the category "parts", you'll have excluded about 25% of the listings (if we're all talking about the same seller!).