I haven’t made one myself, but if you read a little bit in the forum all those questions are answered. Ryan has just released a tutorial on how to scale the router (MP3DP v4 - V1 Engineering Documentation), Doug and Dan (MP3DP v4 - Aza's build) have both made extensive posts about how to scale the build as well as posting a BOM. If you read through those two threads, all your questions are going to be answered in detail.
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