The real Orion has about 1300m/s So the orion should has 1100m/s delta v. The ICPS should has 2000m/s delta v. The EUS should also has 3000m/s. Some people might say this is overate, but it is logical as the payload that the real SLS would has. Also, SEP should be a good idea, as well as an interplanetary habitat and Mars Semi Direct concept EDV, Hab and MAV. Or that oru should made the martian part. Also, love your mod, used this since the first release.