At the very least, you could simply redirect visitors from
ebay.revelstonemodels.com to your eBay store at eBay's normal URL. That way you can print your custom store URL on biz cards, etc., and it'll still work. If you opt to do the redirect with "masking", then it'll appear that your eBay store is located at your URL, since it'll be framed in the browser. Warning: this may be against eBay ToS -- framing eBay content -- so you'll need to research that first. It also may negatively affect your SEO/ranking by search engines for your main site, so that's another consideration.