If you are German or the Language doesnt bother you (I think, u can change it) here is the Link for my Wishlist with all parts, i used for the NAS https://geizhals.de/?cat=WL-986884
but if u want to use the exact same Case, i recommend you to buy this https://www.amazon.de/gp/product/B000ONYSR4/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1
also, because the frontpanel header Supermicro uses ist not a propiatary standard so you need this adapter cable.
In this exact Case and with this exact Mainboard, u can only use 4 HDD´s because the Case only has 4 drives (although there are 2 additional 2,5" places to add Ssd cache or something) and the Mainboard has only 4 Sata-headers, you can sure add a few more, but the Pcie slot is only pcie 2.0 x1.
Btw, Asrock , or to be exact Intel, only specifies the Mainboard with 8gb Ram support, but many people, me included, tested that, and it also works with 16 gb, some people also tested it with 32gb, but it seems like, that this can become a bit unstable, if u dont choose the right kit.