Ultra heavy multirotor frame

Hi,
I'm currently working on a multirotor solution for carrying heavy weight payload (about 15-20 kg).
I'm looking for a frame that would support my multirotor design, the whole thing should weigh up to 40 kg (perhaps 50 kg in the future).
The only requirement for such frame is the abilty to carry around 40-50 kg while it's own weight should be minimal (around 2.5 kg would be ideal), no budget limitation.
I would love for some suggestions as I can't seem to find something adequate myself.
Thanks in advance!

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