I'd say, the moral of the story is: Hire me to design a killer version of a worthless POS on the cheap, admire the rendering forever and never sink a penny into actually building it. Therefore, you'll never be disappointed in the return.
Seriously though, Ron made the point that I was trying to make. If you're building a car as an investment or a "me too" project, hoping for a good return, these aren't the cars you should start with. If you're passionate about a particular uncommon car and you don't care about pioneering some mods and spending some extra money build it how you want, the sky is the limit. That's what these concept renderings are about. At least you won't have to worry about pissing off know-it-all purists that gripe about having the wrong jacking instruction sticker on the trunk lid or the wrong color grease pencil marking on the firewall.