I want to build a 40kg payload quad copter. Please suggest me components

Hardware Multirotors
1

I have experience building quad copters with PixHawk before. I was wondering what set of components would I need to make a quadcopter (maybe with two motor on each arm, 8 motors total) with a payload capacity of 40kg. Similar to the DJI Agras T40

2

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3

I was looking for inputs from the community. If someone already did similar projects and how their ones perform.