A very detailed assembly video of the SainSmart 3018 Prover V2 CNC.
Where you can get one: https://www.sainsmart.com/products/genmitsu-3018-prover-v2-upgraded-semi-assembled-cnc-router-kit
Resource page for information, bit selection, etc: https://docs.sainsmart.com/article/x6sr565m5g-3018-prover