To be fair, the three things you listed are actually pretty easy to make with just a little knowledge about them. I think I could probably make all 3 without trouble. Of course, I think I can also make a windmill without trouble as well. But I definitely couldn't build a vehicle or generator or gun from scratch and we can do those in the game, so making a windmill would be feasible. I still don't think a wind turbine is something they need to even consider, though. Games use windmills for power all the time and players of those games don't mind, so I don't see an issue here. You'd get the few diehards who can't accept a windmill for power, but the vast majority of players will just appreciate a new power source.
Usually as kits that you assemble and not ones you build entirely from scratch, unless you consider adding a generator to a standard windmill the same thing as making a wind turbine.