Hi dude regarding handling customs, rates you got a good picture from QL
only thing i can suggest you is qatar airways have new rule restrictions in baggage,
last month i travel from doha to cochin,

you are not supposed to have more than 2nos of bag as your lugguage, total of 4 i.e. *2 lugguage + 1 handbag + laptop allowed, 40+7(hand carry)+laptop say total of 50 depends on season they give lil flexibility,

hope no one is aware of it,

anyhow its chaged or not am not sure,check it before you fly instead of dying at the airport re-arraging,

thanks

Nice trip