In the link were Woo posted the twin-bay Orion, I just posted a suggestion for a "Light" version of the Orion, with no fighter ramps at all, much like a ship where both sides look like the left side of a standard Orion. There would however, be a small fighter bay (with no ramp) located on the belly, facing forward. Something like this would have fewer fighters than the standard, so to compensate (assume T-V War Era) it would have some missile turrets... which is something I think the Orion on a whole, lacks. The AAA and flak are alright for FS2 era, but before this all you got is heavy cannons with a much lower fire rate. Complementing the addition of missile launchers, might even be mounts for conventional primary weapons, along the same lines as the 2 primary turrets on an Aten. So in my view, assuming this isn't for FS2, leave the conventional Orion the way it is, or have a special variant of it with such additional weaponry, and also add the new weapons to the "Light" and twin-bay versions. As far as FS2 era is concerned, I agree that switching the main beams to the dish style is better.
Later!