You seem to be more qualified than I am, but Relativity is 3D printing the entire rocket, which to me is really impressive [0]

Small launch market is a tough one, especially given SpaceX's cost advantage, but Relativity keeps racking up investment. It's been rumored that their 3D expertise make them future-proof in case plan A, launching rocket, doesn't pan out.

[0] - https://spectrum.ieee.org/aerospace/space-flight/the-worlds-...