"IMPORTANT: You must enable the Reassembly beta under Steam properties to use this mod. The mod relies on features only available on the beta branch and will break if beta not enabled."
Did you enable the beta as stated?

Isnt an exageration by the way exactly 1000 errors

when I try to load this mod it hits me with 1000 errors. the error messages seem to say that none of the factions blocks exist.

mm yes death by a 1000 errors

You mean the parts used for the derelicts, the black holes, etc, right?
If so, you can access them in the sandbox with palette 1829 (note that the black hole will spawn frags which will destroy blocks, so pause and then remove it)

How would I view the hidden parts for this faction, trying to mess around with it, would be great if you told me. Have a nice day