Feels like yesterday I was cutting out these very same templates...
You'll find as you build that you won't end up using all of those itty bitty foam parts as it's easier to just cut bevels into the foam rather than constructing complex joints. Ooh also, with the thigh piece: I found it was very helpful to join the "seal" pieces (those 6 wide foam pieces that sit on the inner part of your thigh) so you don't have to worry about that seam coming apart. So instead of 6 pieces, you'll have 3 wide ones if that makes sense...