Building needs 300G
But i don’t understand your problem installing /e/ on a SM-G935X as according to official google android device list it is an hero2lte
(All Gafams Are Bastards)
Note : i have a GT-I9195X s4mini switched to normal GT-I9195 on witch i flashed TWRP.3.3.1-0 and e-0.18-r-unofficial
a sort of wifi only mini-Tablet (4.3"screen)