Awesomeness, kinda makes me wanna make one, that is after my Weta Odst, Brute Shot, H2 build, Maybe Gravity hammer build. . .Yep besides those it's on the top of my list!
You need Pepakura Designer to be-able to scale it, and I think you might need to scale it, I'd personally, just add a few millimeters but I DO NOT ADVISE that, SEARCH FOR A SCALING THREAD Check your math and Double check it.
Your standard paper in America is letter, and A4 I believe is What the rest of the world uses.
Ruze's is H2
Weta's are I believe simmilar to H3 but different, and was used in Landfall (youtube it)
WETA PAGE 1:
http://405th.com/forums/index.php?showtopic=9396&st=0&p=134442&hl=Belakor%20ODST&fromsearch=1&#entry134442
FEET FIRST INTO HELL!
Edit once again:
Sorry for double posting, I have dial-up internet.
The Weta one has many small pieces as the chest, It is scaled for someone who is about 5' 11 (71 inches) so you might need to scale it abit, DON'T ask me to scale I've messed alot scaling my armor.
My first Scaling of Ruze's ODST helm Made me look like a Bobblehead, and I had to make the chest at total of 3 times.
I serously advise you to watch somethin when you are pepping, I am reading this topic as I'm Pep'n.
Do I have any manners:
WELCOME TO THE 405th
For you...
Right now I'm trying the Weta Odst, but another project I've put on hold is Ruze's H2 ODST you can get Ruze's off the Wiki: http://halocostuming.wikia.com/wiki/Pepakura_File_Index
I'm not a master by any standards but I know somewhat what I'm doing.
EDITED to directly answer the question...