The wool is not for you. Yes, you need a certain amount to complete your quests, but the extra wool will be used by the Vikings.Make that three times. I needed 18 wool to finish things up, so I had 2 8 hour productions running overnight. The second one got the x4 bonus leaving me with 30 extra wool I'll never need or use.
The mead hall can make a ton of copper, but yes, it can be avoided. However, with 4+ hours remaining before you can complete your settlement no matter what you do, there's no reason not to let it build. Don't make settlements all about you, you'll get your rewards from the Vikings no matter what, but why not leave them a real village before you run off?Doing the last bit of work on the current settlement, and I think the Mead Hall can still be avoided. The 2500 copper can be made with just a Market if you have one already and a shrine. Set them both to an hour long production while building the goods buildings which will produce 407 copper, then 2 4 hour productions each while making the goods which should produce 2168 copper. The full total should come out to 2575 copper.
I have no idea how much the Mead Hall can make, and I'm not going to bother checking it.
You do realize that's why they changed the last quest again, right? No one was building the last buildings to leave the Vikings with a functioning settlement. Leave them a functioning settlement. Now there's now no reason not to, other than to spite the Vikings or Inno.