I would check out your local SBDC for some assistance. Mine happens to have full fledged engineering department that can offer everything from CAD drawings to fully functional prototypes. Looks like the assistance you need!
Congrats on at least pursuing what those would call impossible (hey, try try and try again!).
The quote above is a good resource (free) for at least locating someone willing.
You also may try local Universities, our own University of Utah is starting (and BYU already has) programs which offer inventors to submit their invention for research, feasibility and prototype design. They NORMALLY take in very complex projects.
This has the upside of getting numerous variations and research done on your project, as well as garnering interest from the corporate sponsors of these programs (which, these programs almost always have).
The downside, is of course the time-line, a year plus, as well as the Professor. In the end it will be an academic exercise, and so your personal wants as the inventor may be overruled by the Professor of the class and/or program.
-You may indeed fail before you succeed, but don`t make it a habit.