This film sucks and no one should watch it. There really is no reason to make this film, release it or worst of, charge people for it.
When you spend $100 making a film and charge people a normal admission/DVD/BR/rental fee compared to a $100m film, there's something off.
I don't know what the budget of this film is, but it's probably nothing. If you're curious as to know what kind of production this is, watch the trailer, or look at Tornado Films' website.
The question remains - how do you make a medieval/viking film with no money? The answer is simple, you don't. You just don't. Questions like "how do you build a house for $800 or a car for $200" should be avoided.
If you want to make a film with no money, set it in 2016 where you already have tons of 2016 stuff like clothes, music, furniture, cars, etc. If you want to make a film in 816, it's gonna cost ya.
There are ways of doing it cheap(er), but not with almost no money. "Battles" with 6 people look ridiculous. Cheap looking costumes always give Halloween vibes.
There are medieval reenactment hobbyists that go to the park on Sunday that have a more professional looking setup.
I'm guessing these guys did this thing for fun, but they shouldn't be selling it as if it were a real film. Put it on Youtube or Vimeo. I didn't pay for it (friend had the Blu- ray) and I still felt that it was a waste of time.
I really wonder how they'll recoup the costs of this production, but considering how little they put into it, it might just take a few dozen rentals.
I applaud the courage to go out and make a film. Everyone wants to do it, but not anyone can do it. But not everyone should either and not every tiny idea should become a film.