Gouf Gundam has been around a while but I’ve only started going crazy of it since Gundam Build Fighters Try.
This SD we have here ain’t the same version from Gundam Build Fighters Try. This one is based upon MS-07B-3 Gouf Custom.
It first appearance is in Mobile Suit Gundam: The 08th MS Team. Gouf has many variant, the one in GBFT is called MS-07R-35 Gouf R35. While I had one from Daban called Gouf Ignited.
It requires 15 sheets of paper to build and come with pictorial instruction guide which should make things easier than a .pdo guide.