There were many possible ways to upgrade the Tortuous Scream, but the most significant ones demanded the use of a large orbital shipyard over long periods of time.
This was the trouble with starships and especially capital ships. For all of their power and scale, it took exponentially greater facilities to construct them and upgrade their hulls.
Ves much preferred to work with mechs. Their much more compact nature made it easy for a professional crew of mech technicians to repair, modify or upgrade the machines.
Even if the effort was a bit too expensive and cumbersome, the additional costs should still fall within a tolerable range.
Such a modest setup did not apply to an alien battleship as massive as the Tortuous Scream.
Even the E-66 Experimental Shipyard struggled to transform the Tortuous Scream. The facility was only rated to construct ships measuring up to 2.3 kilometers in length.