I'm good for heavy lifting, and can do a fair amount of construction or carpentry so long as you don't want anything fancy. I can sew, but not as good as Bucky and probably not with a modern style machine without being shown how.
I can design things, although I'm no architect. And I might be able to do some cartography in a pinch.
Like most everyone else, I know nothing about water or electric works.
I think that this place is a lot more community based than what you seem to think. Sometimes, though, the big picture isn't all that's necessary. People need to do their own things, socialize, and look out for themselves too. If they don't have time for that, and only work tirelessly toward one common goal, that simply won't be the goal anymore. A community is full of individuals.