Do a search for "Geep", he's got a couple of tutorials for making a Poser measuring prop with Poser primitives that measures with Poser's Native Units, and is fairly easy to convert to real-world measurements. Other than that, I'd say load the M3 skeleton, then David, and try to adjust the scaling on the skeleton to match David. Now, if you're intending on conforming the skeleton to David, you'll probably have to fiddle with the joint parameters to get the skeleton to bend the same.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.