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Apocolypse
Thanos
High Evolutionary
Reed Richards
Forge.

they want to build something to counter or match the CN in power, they get 6 months of prep , they can search the multiverse for reasources
forge (because of his mutant ability to build what ever tech is conceivable) builds the machine with the blue print created by the team

Apocolypse will bring in the celestial tech he has
High Evolutionary will bring in the countless celestial tech he has stolen
Reed Richards contacts all his counter parts from every universe
Thanos will bring in the gem and tech he created by draining the power of the infinity gems
they plan on what will work and what they can do

forge builds the untimate machine

The Celestial Nullifier?

The Celestial Nullifier has the capability to destroy the multiverse, but it can only take one out at a time.

Also iirc, Thanos had 5 Gems back then, and an artificial giant one...