That's the problem with uber-large ships--you hit a limit on the number of turrets. I think the Big C was a good idea gone awry, saying that that Big C's in-game setup was the same as it was advertised by the GTVA. The Colossus was designed to be surrounded by destroyers and still survive--thus the large beam coverage. It is quite deadly in the case of a broadside, though is very weak head-on, as compared to the Lucifer and Sathanas. Remember the Sath is larger than a Colossus--by volume. Most larger ships aren't as well-armed for their size--it just doesn't scale up that way. You need many more crew personal to keep a larger ship running, better weapons require more space, and everything requires more power. The storage tanks for the Colossus take up much more space then for an Orion. The crew has to sleep somewhere as well, and central recreational facilities would need to be larger. Remember how many people are on each ship. The Orion is a town, the Colossus is a city.