I know several of us have started builds already. Thinking that testing, just as in Apollo, might be advantageous, I have joined them. I laid the keel (motor mount) today for Ascent Vehicle #1. (Since it must fit into the booster, the booster will be built subsequent to successful test flight of the launch guidance mechanism of the lander.) More to follow.

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AP used in 2010: 28,044 Ns (36.9% O)
AP used in 2011: 43,488 Ns (6.2% P)
Highest altitude achieved: 21,981' AGL

"Gravity is a cruel and unpredictable mistress"