Save the two files on your computer, they will have the correct size although they have been shrinked to fit screen here.
Building the ring isn't that hard. in fact, the tricky part is to get the ropes cut without shredding them.
If you got patience and skill, though, it won't be too difficult.

As for the Referee attire, simply use it with any AAW cubee you want, by keeping their arms and head.
I've made the ref's sleeves slightly bigger than the cubees arms, so you'll be able to put them over the arms.