Finally got it to work. As pointed, I had to make sure the structure of the lines was the same and hunted a few rogue spaces and I'm finally able to load in. I was greeted by, you probly guessed, more errors!
Good news first, the weapons and armor sets show up in vendor screen just fine, same for horses.
Bad news, the helmets have clipping issues with the character head and are all transparent. I'm guessing the helms don't like the shaders used by Silverstag but I have no clue what causes the clipping.