I agree with Phavoc. This thing can't carry a company of marines, all their gear, and deployment shuttles and still be heavily armed. Missiles are great if you can fire them in huge quantities, which takes space you might not have. Barbettes and triple turrets maximize firepower/space used.
One of my players designed a 200 ton stealth ship to be used to insert / retrieve small teams or cargo. Externally it looks like a free trader. Has M4 and J4 drives, and 4 staterooms. Stealth hull and stealth jump. It has about 2 tons of cargo space, plus a 30 ton module like a modular cutter would carry. That module can be swapped out for different missions. The favorite module holds a 20 ton launch and 2 more staterooms. Another holds 5 staterooms, a med bay and some cargo. Another holds a G-Carrier and barracks.
The "launch" is also stealthed, heavily armored, and can do 9Gs.
It ain't cheap, but it's cool.