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It's an interesting approach and I think it might be reasonable in terms of power. I also really like the amount of redundancy in the setup, but the cost is probably too steep for my preferences

An RPI 4 8gb is approximately 90$, so 15 nodes becomes 1350$

I think there's room for a board with a reasonable sized (16gb-32gb) emmc, 2-4 sata ports (with 4-8gb ram per sata connection), and 2.5/10gbe for smaller ceph clusters

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You could buy drives with higher capacity, then you need fewer RPI, fewer cables, consume less space/energy and still achieve 55 TiB capacity.

Ceph recommends 1gb ram per tb of storage. Going lower gives massive hits to performance and the 1gbe ethernet connection becomes a bottleneck with fewer nodes, so I don't think it's viable to scale this way

True, the Pi 4 with 8GB RAM would allow for 8 TB max recommended storage per node. Thus, requires you to have 7 Pis for 56 TB. I think that's still a good setup, even with 1GE.

btw, 10GE is the minimum requirement for a non-hobby ceph cluster

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