[Suicide Junkie]

Plenty of stuff...

Crew provide hull repairs.
0.001 per crewmember.

Heading through the components file...
Bridge:
No longer provides the radar or enemy display. Get combat sensors, long range scanners or system scanners for that. Holds 10 crew, +1 per level.

Lifesupport:
Larger hulls require more, tech level increases the capacity by 10%. Also provides a small amount of crew regen and toxin resistance.

Crew quarters:
Holds 50 crew, +5 per level. Cannot replace lifesupport.

Power reactors:
Smaller reactor components, and generation rates are much much lower. You will need a lot of them to power a warship. Comes in single or double, with standard or quantum available in both sizes.

Energy Storage:
Much more availability, comes in actually useful sizes. For light warships or civilian craft, a large energy tank will be enough to keep the PDCs and a few weapons running during a short battle. Add a small reactor to slowly recharge the energy tank during the long periods of safe travel.

Engines:
Cost goes up much faster than stock, so the powerful ones are harder to get.

Shields:
Each generator has built-in regeneration. Shields are relatively weak, but recharge continuously. 5hp/kt +1.5 per level
Extra-Tiny shields are available for fighters to use.

Armor:
Quite strong, but repairs are not worth your time or money. You can usually save 50%-75% by selling your ruined armor and replacing it with fresh armor from the store, rather than repairing.
Specialty armors may be worth repairing since they are quite rare. Specialty armor ability amounts increase linearly with armor size for most abilities.
20hp/kt +2hp/kt per level for standard armor, less for specialty armor.

Medical Bay:
Provides lots of Toxin resistance and crew regen.
Crew of 10, +1 per level.

Repair Bay:
Pricey, but provides 1 repair, +0.1 per level.

Plasma Capacitors:
See energy storage & reactors, above.

Point Defense:
Spearated into PDCannons for anti-missile fire, and PDLasers for anti-fighter fire.
Only one type on a ship at a time, or they won't work.

Emergency components:
Emergency energy remains, as well as emergency hull repair. The others have been removed.
Cryostasis pods which hold extra crew are extremely rare, and illegal, but you may be able to find some if you look through the commodities.

Illegal cargo:
Some illegal cargo can be used. Ionic bombs, for example can be fashioned into makeshift mines.

Mines:
Standard mines do a relatively small amount of shield piercing damage.
Heavy mines do a large amount of normal damage.
Ion Mines will disable your engines if you run ito them.

Weapons:
Graphics have all been changed to match SE4 images... APBs are purple sparkly beams instead of green, for example.

Weapon damage is scaled down a lot. Expect running battles, and to take a lot of hits. Expect to survive internal damage a lot too. (This is where backup lifesupport and a large crew for repairs can come in very handy)

Light weapons have been split into three Versions:
1) Light-only (for AIs)
2) Light (found in stores, can be mounted in heavy slots too)
3) Heavy mount - +50% size, +100% damage, like in SE4

Heavy weapons have only the heavy-slot Version.

Torpedoes have been changed from seekers to directed torpedoes. Can't be shot down with PD, but if you're quick you can dodge them. They will turn to track a target.

Meson bLasters are weak per shot (~3 damage), but fire very rapidly. Popular on fighters and pirate ships, the large volume of fire is hard to dodge.

Fighters
Fighters are much more durable, and can take quite a pounding. If they carry shield regenerators, you may need to try and hit them with capital ship weapons in order to swat them quickly.

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Other Notes:
The TCN is pretty powerful. Don't get in their line of fire when they wield their quantum torpedoes, or you're liable to have a smoking hole in your ship.