1) Is my idea too "cheaty" for GregTech? Am I supposed to do the turn on/turn off on alloy smelter, or to have multiple boilers per one machine?
2) Is there a GregTech way to store the liquids, so I am not supposed to use different mods?
3) What liquid-container-mod is best for use with GregTech?
1) There is nothing "too cheaty" for gregtech except a cheats itself.
2) No (may be Greg himself knows better).
3) RailCraft.
Don't forget, that unless this is specially described, any tanks will not auto output fluids in GT pipes, you have to use "pump cover" and set up it with screwdriver.
Also, i saw "gregtech survival guide" somewhere around. Try to google it.
EDIT:
Aha, found it: [WIP] Gregtech Survival Guide [v2, GT5, 1.7.10]