I have the Estes Shuttle stack and am a big fan of all things shuttle, despite the problems with STS during its history. It's still an incredible machine, warts and all. I'd be interested in George's kit as I am sure it will be well engineered. Despite the claim of it being more for flying than scale detail, I have no doubt it will still look really good, given its maker! As far as Sheri's kit goes, who knows if you can even get one with everything that's going on with her right now. A shame, as all her scale kits are top notch.
Glenn