Here is a good solution. After having done a lot of various tries I definitely recommend getting such an adapter!
Amazon.com: StarTech.com PYO2SATA 6in SATA Power Y Splitter Cable Adapter - M/F: Computers & Accessories
NCASE M1: a crowdfunded Mini-ITX case (updates in first post)
Amazon.com: StarTech.com PYO2SATA 6in SATA Power Y Splitter Cable Adapter - M/F: Computers & Accessories
NCASE M1: a crowdfunded Mini-ITX case (updates in first post)
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