Ok I will email my attorney that "Some guy named atYevP on HN told me it was okay." ;)
It would not be a problem for Back Blaze being acquired.
I agree with the parent though, if I were in busines and wanted to use your drawings, I wouldn't touch them with such a license. Even as a personal hobby project I would bug you for (official & written) permission before using any of the diagrams.
Other than that, it is nice reading about the technical decisions that go into building such racks. Kudos for sharing the knowledge!