This model have many and very small parts, especially its fullarmor-thing. This papercraft now free (check also Wing Zero gundam papercraft which is free too). There are link at below post
Some preview. You might want save for references:
viewer, which can download at tamasoft.co.jp
The file including 2 kind of patterns/template to choose,
COLOR patterns, print like usual in white paper. its good to use 120-160 gsm papers. And BLANK patterns, you should print in colored already papers. You can use fancy paper, like jasmine, or brand like majestic and stardream.
Here's the link Full Armor Unicorn Gundam 1:144
From google drive go to File>Download.
Zip files can be opened by WinRAR, IZArc, or any compressed file opener.