Hello there! It has been done before on this board
obligatory link: (Or is it okay to necro that thread? 
)
I'm posting my take of the AF Mk I as defined by the original entry for it in WEG Rebel Alliance sourcebook (2E), the 1E being the first source to stat out the AF Mk.1.
I underlined the indications of changes and performances of the AF in the WEG entry (edited) below. Additional weaponry is stated to be 5 additional turbolaser cannons and 5 additional laser cannons (heavy for the AoR version). Would like to hear feedbacks on the stats, thanks!
Started with the AoR Imperial Dreadnaught and then modified her stats based on the underlined changes. Nowhere in the entry, it was ever stated that there were other laser cannons beside the 10-15 laser cannons themselves or even that some of the turbolasers were converted to additional laser cannons (seriously no one looked up the source materials aka the original Sourcebooks for Imperial and Rebel Alliance in WEG?). So there you have it.
Assault Frigate Mark I
Although it is difficult to tell, the Assault Frigate Mark I is actually a highly modified Imperial Dreadnaught heavy cruiser.
To economize fuel consumption and increase capacity, the techs stripped off huge amounts of the superstructure. They also added two massive dorsal fins to increase the ship's maneuverability.
In addition, huge portions of the ship have been retooled to replace human crew with automation. The original Imperial Dreadnaught required a crew of 16,000 in order to operate, far more than any other war vessel of comparable size. This is simply not practical for the Alliance, who has a much smaller manpower pool to draw from than does the Navy, and an infinitely smaller pool of trained crew. Once the Alliance techs were through with the ship, it required a little less than one-third the original complement to operate. Unfortunately, the Assault Frigate Mk. I did have to sacrifice offensive capability -- while it has additional weaponry, crew members and power generators were diverted from the interior of the ships, resulting in shorter ranges and a lower fire rate for the turbolasers compared to the Dreadnaught.
Unlike its Imperial predecessor, the Assault Frigate Mark I has no docking bays or landing platforms, but there are 20 umbilical docking fixtures along the ship's surface. Several of these are large enough to dock a transport/heavy freighter, while the rest are better suited to starfighters and light freighters. The ship cannot carry docked craft through hyperspace.
In addition, each assault frigate carries a modified Imperial assault shuttle piggy-back atop its superstructure. The frigates are able to carry these vessels through hyperspace.
Because of the exhaustive and expensive refit, there are very few assault frigates currently employed by the Alliance. Those that are in services are extremely effective, however, and, as time permits, more will be added.
Silhoutte: 7
Speed: 3
Handling: -1
Defense: Fore/Port/Starboard/Aft
2/2/2/1
Armor: 6
HT Threshold: 90
SS Threshold: 35
Hull Type/Class: Medium Cruiser/Assault Frigate Mk. I.
Manufacturer: Rendili StarDrive.
Hyperdrive: Primary: Class 2, Backup: 12.
Navicomputer: Yes
Sensor Range: Medium.
Ship's Complement: 5,000 officers, pilots, and enlisted crew.
Starfighter Complement: 1 Imperial assault shuttle.
Encumbrance Capacity: 7,500
Passenger Capacity: 100 troops.
Consumables: One and half years.
Price/Rarity: Modification/#?.
Customization Hard Points:
Weapons:
Eight forward and seven aft medium Dreadnought turbolaser batteries (Fire Arc Forward, Port, and Starboard or Aft; Damage 10; Critical 3; Range [Medium]; Breach 3, Linked 1, Slow-Firing 3). (15 batteries)
Ten port and ten starboard light Dreadnought quad turbolasers (Fire Arc Port or Starboard; Damage 9; Critical 3; Range [Short; Breach 2, Linked 3, Slow-Firing 3].
Five forward, five port and five starboard heavy laser cannons (Fire Arc Forward, Port, and Starboard or Fire Arc Port or Starboard; Damage 6; Critical 3; Range [Short]]. (15 cannons)
ADDITIONAL RULES
Massive 1: When making an attack targeting this starship, the Critical rating of any weapons used counts as higher.
Power Shortage (Turbolasers): The turbolasers on this starship take one additional round to fire and lose a range bracket. The stats has been already adjusted for this.