Congratulations on launching Scaphold. I tried my hand at founding a Node.js PaaS startup (NodeSocket)[1] in 2011, and while promising in terms of attention, silicon valley media, VC meetings, there was never a path to a sustainable PaaS business. Howerver, things have changed. Technology and mindsets have evolved, and Firebase, Parse, and Serverless.com have shown there is perhaps a future in BaaS.
My only words of advice are focus on the business and finances just as much as the coding. Unfortunately the best engineers and technology don't always win (see RethinkDB). I'll be tinkering around tomorrow with Scaphold, might work out well for a side project of mine. Best of luck!