I'm bringing this topic back from the dead, with updated code. I don't even remember who's code it was that I modified, it's been a while, but thank you for writing it. So earlier this year I took code from this thread and updated it to work with the then-current version of makehuman (dated june 16.) I was going to post this a lot earlier but, well, procrastination hit me.
I stuck code in there from the example plugin to figure out how coding works, and I haven't removed it yet it so just ignore the "this button has been hit x times." More importantly though, I couldn't get the volume/surface area estimations to work so instead I outsourced it. You have to export your model to blender, use the 3d print toolbox plugin that comes with it to get the volume and surface area, and then go back to makehuman and manually enter the values. But it does work.
I'm pretty sure I had some sort of problem with the whitespace characters so I'm putting it in pastebin, it feels safer.
http://pastebin.com/rGuNdCM2