If you are planning to build a "Pure X" quadcopter like a Krieger, Mitsuko, Mixuko, or QQ190, the hardest part is getting all the electronics to fit. This video series will show you how to build an electronics module that will easily install into this type of frame.
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If possible, I would suggest using an F390 ESC instead of the LB20 that I am using. The LB20 Pro or the LB30 are both good choices, as well as the DYS XM20.
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These are not affiliate links, just links to good products that I think are worth using.