Just a little piece of mind, a local guy bought a dropout for an 08 gt500 and swapped it into his 09 gt. I was told the final cost after everything, including upgraded parts was $9700 (approx.). You may be able to find a complete dropout cheaper than you think. I'll ask him again how much he paid for his dropout, but I think it was around $8500.
2010 v6, 5spd,
MGW shifter, Bama tuned, True dual exhaust, gt500 mufflers, many ext. mods, much more in the works