Skysheet is alive. It's taking so long because it's hard, yet mysteriously doable, so (assuming sufficient stubbornness) there is reason to keep going.
There's little information because we don't want to let the 'talk' part get ahead of the 'show' part--not out of stealth, really, it just feels like the right way to be. But if anyone has questions, I'm happy to answer.
Startups can survive once the founders have moved on to working on something else full time, but in practice the survival rate of such startups is tiny.
Vladimir worked with me on an early incarnation of the program but left before we incorporated the company or applied to YC. He's very good.