I'd urge you to open it up sooner rather than later, since you state that it is your intent to open-source the code. There's no harm in declaring that it's alph

I'd urge you to open it up sooner rather than later, since you state that it is your intent to open-source the code. There's no harm in declaring that it's alpha/beta quality, and also no harm (indeed I'd regard it as a strong positive!) in being strongly opinionated about the direction you're taking it.