I performed a fully reusable mission to the surface of Eve and back to the KSC with 100 Kerbals. The mission also features the following: visiting Minmus and Eve monolith, no ion engines, no nuke engines, no parachutes, no mining on Gilly, normal difficulty settings including ComNet, athmospheric flight half way around Eve, an ocean crossing, and ocean landing and suborbital docking.
The mission was performed in stock KSP 1.7.3 without addons. Only the mods KER, precise node and better time