The secret bases are no mod, they're just space stations hidden in storm sectors, or (not so secretly) in asteroid fields.
Some of the mods that I did make:
A machine shop, much smaller than the original repair bay, but only does 1 component per turn. Good to fit on regular ships if you feel like it.
Ablative Armor. 5 Levels, 1Kt space, 6 to 15 Kt damage absorption. Note that shields provide 8 hitpoints per Kt at best. This is so that there is a point to armor in combat. You can either have shields, which regen after battle, are armor, which must be repaired slowly, but protects better.
Shields: the hitpoint values have been swapped from normal & phased. I figure, you can either have more hitpoints, OR block phased weapons. Its another tradeoff decision, that depends of what your enemy is doing. Shields also regenerate a token amout of shields during battle (5 points for Shield V) Its just for atmosphere, really, the only real effect is on the difficulty of ship capture.
I also spread shield regenerators out, so you get A new regenerator level every two shield tech levels, rather than all at the end.
I also boosted the output of Massive Planetary Shields, to 10,000, seeing as they were pretty useless as they were. I may even boost that higher, and make the ruins technology researchable, at the end of the tech tree.
For a humans vs Humans game, I would probably make bases have limited supply, and resupply depots more expensive, So solar panels are needed, (or resupply ships).
Just thought of another thing I did:
Supply storage: is now 5KT of space.
If you think about it, an engine stores the same amount of supply PLUS moves your ship. Supply storage should be smaller than an engine, rather than LARGER.
What I also want to do (when exams are over) is to add components for an organic race, such that most components have living Versions that will regenerate just like the armor. HaHa. Those Ion weapons won't slow me down for long

Tachyon bLasters? One turn and the organic weapons are ba-aack

Not sure what the disadvantage would be. Cost, maybe?
Crossover techs would be really cool. Such as organo-crystalline armor, that pumps up shields AND regenerates when destroyed.
[This message has been edited by suicide_junkie (edited 06 March 2001).]