I'm not against downsizing it a bit. I will have to adjust the size of the bridge (it is currently matched to the C9, with a fleet command bridge area below the ship control bridge).
A few things. It has to comfortably launch Maveq size ships. There is no need to contain ships like a BOP because they are already designed to be deep space vessels. The Maveq is not, however.
Second, it has to be able to carry around 20000 troops. Think of an entire invasion force. There is no need to have the dropship vessels since the ship is designed to handle massive movement of troops using transporters. It does carry a few large dropships however to carry around 1000 troops total.
This ship should carry a squadron of 15 fighters, and enough cargo capacity to replace 4 Ferengi Groumall type standard cargo carriers.
(side note: I contend the Groumall is actually a Ferengi design sold to the Klingons, Breen and Cardassians. This is my way to explain why they use the same ship with some small changes)
This vessel has 3 distinct power cores...one in each wing contained entirely in the nacelle/cannon assemblies at the end of the wings, and one in the mainframe hull of the ship, as well as 20 power and impulse cores. She carries a crew of almost 2500, including two distinct engineering crews and a hangar deck crew.
This is the anchor to an operational fleet, and requires support vessels for normal operations. An operational FOB fleet containing this vessel would normally contain 2 Battleships, 4 battlecruisers and around one dozen smaller escort and support craft, 10 of which are usually BOP. This vessel can support a full fleet as large as 300 vessels.
Now, to the weapons. This vessel will have many moving disruptor batteries across the hull. It will also have a few rotating torpedo launchers. The forward heavy weaponry is designed to engage something akin to a Capital Dreadnought, planetary target or Starbase, generally not targets that would have huge maneuverability. This weakness for the ship is important, because the devastating weapons would not be effective against smaller vessels since the entire ship has to be aimed to fire them. The ship is not really designed for that purpose.
The armor this ship has comprises about 40 percent of it's total displacement. Most Klingon vessels average around a 25 to 30 percent ratio for armor, so this ship is more akin to a Gorn ship with respect to armor, or the same as a Starbase or Battlestation. As a result, it tends to be slow and lethargic with respect to turning ability and has a maximum cruising speed of Warp 6.5. It can, however, push speed to Warp 8 for very short periods.
The other unique thing about this ship is that, much like most stations, it has the ability to manufacture materials for ship repair with the machinery needed on board. It even contains a dilitium refinement machine and can produce small quantities of core grade dilithium.
BTW, here is a few pics of the Infinity class. I'll post more pics and info on this ship later. All I will say now is this is the flagship of the Federation 3rd Fleet, the Starfleet Marine Corps. If your wondering about the scale....look at the nacelles. That should give a clue.