Where is everyone getting a length of 1100 meters for the Interdictor? Everything I've ever seen for an Immobilizer 418 Cruiser is 600 meters. The "interdictor star destroyers" are bigger, but what we got in the game is clearly the Cruiser variant. That would also have it scaled perfectly with the Pelta. I know, theres a "sliding" scale in Armada (which used to bug me more than it does know, I just think of the game table as an admirals threat display.
Beyond that, everything I've seen on the Venator has it within 100 meters or so of an MC80, so I think large is a better fit for it. Would also like to see it as a broadside ship, 4 red, 2 black or blue with an absolutely monstrous squadron value and 2 offensive slots.