Ok, seeing as I got no reply, I took the initiative. I have made 2 mods for you;
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Cheap Capital Ships for Mike
All Capital ships now cost 500 Credits, 50 Metal, and 20 Crystal.
No other alternations.
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Cheap Capitals + Bigger Fleets for Mike
All Capital ships now cost 500 Credits, 50 Metal, and 20 Crystal.
All Capital ships now use 10 supply instead of 50, and your Capital ship population capacity has been increased by 5 times for each research level. In Layman's terms; you can now have 5 times more Capital ships than normal.
No other alternations.
These changes are game wide, and will have the same effect for the AI players. I don't know what kind of performance issues will occur when you have an 80 vs 80 Capital ship battle. Good luck, and glad to help

Edit: Oops, link might help:
Rapidshare Link
Some thing has F*cked my post, it was in paragraphs but it seems the forum 'update' has caused some side effects. Sorry for this, just try to read through the mess of words.

Edit2: You might have to change the line in Gameplay.constants in 'GameInfo' for maxShipSlots, which is right at the top of the file, change it from 2300, to something like 5000. It might not make any difference, but if you encounter problems, do that.