I wouldn't use it as the main Colossus HTL anyway, maybe as a prototype or Mark II. The Concept Art is very different from the final model, and IMO it should be the final model which is expanded on. Probably a special super secret test variant, or an early stage of the Colossus (before it got gutted and reconfigured... Maybe they found out the old configuration wasn't suitable for beam cannons, so they changed the entire configuration of the ship to the one we see in FS2).
I'd like to see a super high poly HTL Colossus which is more like the actual one we see.