This gundam paper model is a SD RX-78-4 Gundam Unit 4 (aka "G04"), a Gundam from Kunio Okawara's MS Collection (M-MSV) original design series, designed by Kunio Okawara as the 4th Gundam, the papercraft was designed by Josey, and shared by Ziyi.
The RX-78-4 Gundam Unit 4 was updated to be used in the video game Mobile Suit Gundam: Encounters In Space as well as the manga Mobile Suit Gundam Side Story: Space, To the End of a Flash.
The RX-78-4 Gundam Unit 4, more commmonly referred to as "G04", was more advanced in many ways than its more famous predecessor. The Federation decided to convert the Gundam units 4 and 5, which were already in development, into space combat versions for use as main forces in the invasion of Solomon, A Baoa Qu, and then Zeon itself. These machines were of course based on the RX-78-2, and the replacement of the backpack and the addition of thrusters and propellant raised their mobility by roughly 40 percent. Their operating time was also extended, and it was anticipated that they would produce great combat results during lengthy battles, especially in attacks on space fortresses.
The biggest change was the elimination of the core block escape system. The resulting space was used for cooling systems, thus increasing the generator output and enabling the use of more powerful beam weapons. As a result, the armament was upgraded to include an enhanced hyper beam rifle, and one beam gun was installed in each forearm. Plans were also made to equip unit 4 with a mega beam launcher. Thus its generator output was further increased, its cooling systems were enhanced accordingly, and the design of the cooling fins in its chest was changed. [Source: wikipedia]
You can download this papercraft template here: SD RX-78-4 Gundam Unit 4 "G04" Free Paper Model Download [Instruction]