Time to revive this thread with my last creation:
That beast weighs 14 kton without the payload, and is able to hold a full build space in its fairing.
It is its first flight, time to test it.
Lift-off!
The launcher quickly gains speed:
Each of those boosters have 18 Titan engines. With the main core, that's 20 ktons of thrust overall.
Then, booster separation:
Now the main core with its 56 Frontier engines is alone.
Fairing separation:
And orbit:
The payload weighs 3600 tons, it corresponds to a build space completely filled with fuel tanks. And I could even have done better, I had 20% of fuel left.
Mission accomplished
It works better than the SLS...