OK, so I actually made myself get after it and finished my new RetroPro in time for tomorrow's race. Due to the angled nature of the main rails, I don't think this one can become a parralelogram; I'm sure it can become something worse, but probably not a parralelogram. LOL I took a couple of y'alls tips to heart in an effort to prevent launching. I mounted the body more forward than usual for me, and I cut out air vents up front to try and relieve air pressure under the body(Hershman confirmed it was OK). Anyway, here's a couple pics while it's still new; tomorrow evening, it may not look like this any more: