I recently downsized from my 450 quad to a ZMR 250 unit.   The purpose of this post is not so much of a step-by-step but rather a collection of tips, suggestions and lesson's learned to help should you go down a similar avenue to build your own quad.   There are plenty of video's and how-to's out there once you know what set-up you want to go with.  I will reference mine as well as…
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