Hmm.. it is difficult to say exactly how easy/hard it would be to build.

The bigger scale generally hints are more parts (and more of smaller parts) to combine together.

But the fact that it does not state whether it's a Master or Perfect Grade may mean the skill level is relatively lower.

I have built a couple of 1/100 Master Grade kits. Provided you read the instructions carefully (they are not hard to understand), it is simply a matter of time (if you go slow like me, an MG 1/100 takes around 6 hours or so).

Think of building LEGO kits on steroids, does that analogy help?