need to make a multi rotor to lift a weight of 6 kg

[flanker]

hi folks
i am newbie to multirotors, earlier i have made an 450mm quad with kk2.1 control board.
Now for a college project i have to make a multirotor which can lift a weight of 6 kg , it should be autonomous ,fail safe and have flight time of upto 30 minutes.
i need valuable suggestions on
1.which configuration will be better ? a quad/hexa/octo
2.which frame to use ?
3. which motors to use?
4.Dji Naza/A2 or pixhawk?
5. which battery to use?
the budget of mine project is $3000 more or less.
i own a Futaba 14SG 14-channel 2.4GHz radio system

Thanks.

 

[PsyBorg]

Not sure what to recommend for this project so I looked up what it would take to lift 6kg... Pretty sure just one of these could easily do the trick. Not suggesting to use this just thought it was neat to see and maybe motivate you a bit knowing it can easily be done.

https://youtu.be/77uK19KxMuI?list=PLhN5mcwkUghE7pi7AMpVFfoC8KAkzYDKD