Sorry to hijack your thread...
I do have another '57 kit in the closet, though it's the 'high tech' AMT kit, the one with photo-etch and rubber hoses.
That, will likely be build box stock, though it's far to early to tell, as I have a huge pile of un-finished projects to complete before I can even think about starting anything at all.
Again, the best of luck with your project.