Thinking of producing these for sale. Feedback please

Some of the things I learned while providing parts and services ...
Universal application is where the sales numbers are, and I hope you find the spare tire cover to be the same in many many models.
There are those who need nothing more than measured drawings.
Not every owner has the DIY workspace, tools, skills.
The many owners who barely find the time for a round of golf/whatever typically have money to spend. Good luck