Red Alter was a total conversion based on C&C3;: Tiberium Wars, based on own alternate history of WWII ending and later Cold War, which gone hot.
This is the second of the concept-art of Hypersonic Missile Superiority Interceptor "Gagarin", drawn by our artist TheXHS.
Supersonic high-altitude fighter-interceptor with two jet engines and two rocket engines.
Scramjets. Use Scramjets, they are more appropriate for an aircraft.
In this airframe we can't place scramjet, this shape of intake and nozzles, permit only classical jet engine (maybe hybrid ramjet-jet, such as GE-J-58 on SR-71)
This still is only the concept art. The modeler can reshape the intake.
Well, we try to make the models as close to the concept arts :)
For example the following concept art "Gagarin" we modelled very accurately.