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Hey, love your work, I got a question though its my first time building a drone of any sorts

After printing the bottom part of the quadcopter I realised that the original comes with a built in circuit for you to solder the ESCs to. But i had already ordered a DJI Nava-m with gps and got myself a set of motors and escs. How do i put everything together?

I was told I need something called a PDB and I connect everything to it, and connect it to the LiPo battery. Which PDB is suitable for what i have?

Would appreciate the help, cheers.