So, something like this?
Tramp JumpShip Armed Merchant Carrier
Mass: 250,000 tons
Technology Base: Inner Sphere (Advanced)
Introduced: 3125
Mass: 250,000
Battle Value: 3,182
Tech Rating/Availability: E/X-X-F-F
Cost: 525,310,833 C-bills
Fuel: 500 tons (1,250)
Safe Thrust: 0
Maximum Thrust: 0
Sail Integrity: 5
KF Drive Integrity: 6
Heat Sinks: 122
Structural Integrity: 1
Armor
Nose: 12
Fore Sides: 14/14
Aft Sides: 14/14
Aft: 12
Cargo
Bay 1: ARTS Fighter (6) 3 Doors
Bay 2: Small Craft (2) 1 Door
Bay 3: ARTS Small Craft (2) 1 Door
Bay 4: Fighter (12) 3 Doors
Bay 5: Cargo (401.5 tons) 1 Door
Bay 6: Cargo (401.5 tons) 1 Door
Ammunition:
None
Dropship Capacity: 0
Grav Decks: 1 (140 m)
Escape Pods: 10
Life Boats: 5
Crew: 10 officers, 39 enlisted/non-rated, 10 gunners, 44 bay personnel, 34 passengers, 21 marines
Notes: Equipped with
1 MASH Equipment (6 theaters)
4 Space Mine Dispenser
134.5 tons of improved ferro-aluminum armor.
Weapons: Capital Attack Values (Standard)
Arc (Heat) Heat SRV MRV LRV ERV Class
Nose (38 Heat)
2 ER Large Laser 24 2(16) 2(16) 2(16) 0(0) Laser
2 Laser AMS 14 1(6) 0(0) 0(0) 0(0) AMS
FRS/FLS (54 Heat)
1 ER Large Laser 12 1(8) 1(8) 1(8) 0(0) Laser
2 Laser AMS 14 1(6) 0(0) 0(0) 0(0) AMS
1 Sub-Capital Laser /2 28 2(20) 2(20) 0(0) 0(0) Sub-Capital Laser
ARS/ALS (54 Heat)
1 ER Large Laser 12 1(8) 1(8) 1(8) 0(0) Laser
2 Laser AMS 14 1(6) 0(0) 0(0) 0(0) AMS
1 Sub-Capital Laser /2 28 2(20) 2(20) 0(0) 0(0) Sub-Capital Laser
Aft (38 Heat)
2 ER Large Laser 24 2(16) 2(16) 2(16) 0(0) Laser
2 Laser AMS 14 1(6) 0(0) 0(0) 0(0) AMS
Edit: Made a couple errors with crewing that I had to fix, which resulted in needing to drop the dual SCL/1s to single SCL/2s, but that got me back a little more cargo. Also, I forgot to allocate the MASH unit. Thought about a small naval comm-scanner, but that's 50 million before multiplier.