Nothing wrong with a Mach 1 "Tribute" convertible!
Not in the least... I think your car is freaken awesome! ::thumb::
I also think they should've had a Mach 1-trimmed convertible as well (the original Mustang prototypes had "Mach #" code-named models that were typically open-top cars, after all). Honestly, there's nothing particularly special about the Mach 1, aside from the decals and "05" in the VIN - all of the items available on a Mach 1, could be ordered as optional items on any other model.
But Mach 1 stickers on a 'vert [that I would be owning] is just not for me. Without trying to be offensive - please understand - putting Mach 1 stickers on a non-Mach 1 car (to me) is like putting a "turbo" badge on a non-turbo car (or a Type-R badge on an import with aftermarket rims and a fart cannon muffler). Just a personal thing of mine.
You've always been up-front and never claimed your car to be a Mach 1, or rather, you've always said, "Mach 1 Tribute Car." And that's fine because you've always been honest about it. It's the ones that slap on the stickers and purport their car to be something it's not for the sake of boosting the value somehow... those are the ones that have ruined the whole Mach 1 thing for me.
And again, it's just my hang-up... I still support the "build it how you want it" message.