I'd hope that it takes more than 2 months for specs at Boeing. No, we don't write the specs that long, if any. I mean that would be so w-word. In our case while usually almost everybody is on the same page that legs should be attached lower and hands - higher, the actual attachment points and number of the legs, hands, etc. may be pretty fluid through the iterations, and especially the things like number and topology of digits or the shape, number and location of eyes and other sensors.

Having worked at Boeing, I can tell you their specs take way longer than two months to write. That's a good thing.

What's the point of delivering this type of software piecemeal? A new airliner takes 10 years or so to produce. There's no value in shipping half an airplane.