A wise man once said "Once you get to Kerbin orbit, you're halfway to anywhere in the Kerbol system". Apparently he never tried to fly a 184-seat SSTO to Laythe.

Craft download: https://kerbalx.com/Eric_Hamann/Athena
The SSTO with all its parts and performance is completely stock and the craft will work in any stock KSP 1.2 install. Mods in this KSP 1.2 install are:

VISUAL MODS:
Environmental Visual Enhancements
scatterer
Reentry Particle Effect
OTHER:
Module Manager
Kerbal Engineer Redux (for the orbit/deltaV info)
Camera Tools (for the stationary camera shot in the beginning)
VesselMover Continued (to get the 184 kerbals out of the craft in a matter of hours instead of days)


MUSIC:
Carol Of The Bells by Audionautix is licensed under the Creative Commons Attribution license (https://creativecommons.org/licenses/....
Artist: http://audionautix.com/
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Fanfare for Space by Kevin MacLeod is licensed under the Creative Commons Attribution license (https://creativecommons.org/licenses/....
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/
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Heroic Age by Kevin MacLeod is licensed under the Creative Commons Attribution license (https://creativecommons.org/licenses/....
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/
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Constancy Part 2 - The Descent by Kevin MacLeod is licensed under the Creative Commons Attribution license (https://creativecommons.org/licenses/....
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/
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Hero Theme (Sting) by MK2
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Pilots Of Stone by Audionautix is licensed under the Creative Commons Attribution license (https://creativecommons.org/licenses/....
Artist: http://audionautix.com/
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Action Hero by Jingle Punks
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Hamster March by Kevin MacLeod is licensed under the Creative Commons Attribution license (https://creativecommons.org/licenses/....
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/