I am just making an observation here, but after years of comparison I believe the most accurate classification of the Daedalus-Class Deep Space Carriers is not as a Battlecruiser, but as a cross between a modern Guided Missile Cruiser and WW-2 era Escort Carrier. First the ship has firepower similar to that of a Ticonderoga-Class guided missile cruiser or CG. Her Airwing is roughly the size of that of a Bogue-class Escort Carrier or CVE of World War 2. Those ships carried between 15 and 24 aircraft typically Grumman F4F Wildcats (12) and TBF Grumman Avengers (9). The Daedalus-Class carries only 16 F-302 fighters where as a Nimitz-Class Aircraft Carriers or CVNs carry between 85-90 fixed wing aircraft and helicopters these incould Attack Fighters, Early Warning and Electronic Warfare Craft, Cargo Planes, ASW Helicopters and SAR Helicopters.
For Stargate a ship that would equal Battlstar Galatica's Battlestars would cross a Nimitz-class CVN with an Iowa-Class Battleship or BB as rebuilt in the 1980s to include the ability to launch anti-ship missiles like the Harpoon and Tomahawk-Class Cruise Missiles. This type of ship would have a crew in the low thousands including the Air Wing. It should have a good mix of heavy guns, medium guns, light guns and missiles.