How hard will it be to mod the game to add in new launchers/spacecraft?
Posted: Wed Feb 20, 2013 2:51 am
By that, I don't mean massively changing each "episode" to do something totally different; but adding new types of launchers and spacecraft to that episode.
There were a lot of proposed Saturn variants such as:

Saturn IB/Centaur
Had a Centaur (called the S-V) as a third stage. Basically a Titan IIIE but years earlier.

(L to R)
INT-17: S-IVB and S-II (with HG-3s replacing J-2s)
INT-18: S-IVB and S-II (with 2 to 4 Titan III SRBs)
INT-19: S-IVB and S-II (with 4 to 12 Minuteman ICBM first stages)

INT-20: S-IVB and S-IC (4 and 3 engined version) -- intended as a replacement for Saturn IB to achieve commonality in production.
INT-21: S-II and S-IC. Never flown, but a related variant was used for Skylab.
There were a lot of proposed Saturn variants such as:

Saturn IB/Centaur
Had a Centaur (called the S-V) as a third stage. Basically a Titan IIIE but years earlier.
(L to R)
INT-17: S-IVB and S-II (with HG-3s replacing J-2s)
INT-18: S-IVB and S-II (with 2 to 4 Titan III SRBs)
INT-19: S-IVB and S-II (with 4 to 12 Minuteman ICBM first stages)
INT-20: S-IVB and S-IC (4 and 3 engined version) -- intended as a replacement for Saturn IB to achieve commonality in production.
INT-21: S-II and S-IC. Never flown, but a related variant was used for Skylab.