Glad to see the Ryzen Budget Gaming Build! :-)
A newbie question: If I wanted to go with a micro-ATX board, what would you recommend? I was looking at the Gigabyte GA-AB350M-HD3 AM4 (currently $85 on Amazon US) It only has 2 RAM slots, but does support CrossFire. Not sure if that's the same as CrossFire VX that would allow 2 RX480's or 580's.