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Don't throw away your old PC—it makes a better NAS than anything you can buy
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
They make m.2 to SATA adapters that have like 10 SATA ports. A laptop motherboard in a case with one of those would be very interesting. I have plans for one but I need to buy some parts (keyboard and laptop fan).
Edit: the adapters run hot and are kind of fragile. I'd recommend having a thermal pad under it thermally coupling it to the motherboard and giving it some support.