Just a quick question. Is the Jade Engine Stable (In terms of design) enough to start using for building prototypes?

I think so -

It's definitely a somewhat moving target, but if you stay active with it, I don't think it'll be too bad. The design so far has been stable enough that changing things for prototyping has been pretty easy.

It partly would depend on what you're trying to prototype. Some things are still very immature or nonexistant, so it might be difficult to work on certain parts, but others are coming along pretty nicely and unlikely to change (much).

-Reed

Okay. Noted.

For me, Stable is not enough to use. Most importantly we must consider the feature that could suits our needs. The design so far has been stable enough that changing things for prototyping has been pretty easy.
It partly would depend on what you're trying to prototype.  I really agreed that some things are still very immature or nonexistant.

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Rapid prototyping