SEII AI

[Suicide Junkie]

SJmod is good for that. The hardest part is getting that mobile construction ship to the site... minimum size 1000kt, and they're dang slow at that size.
And with the cubic increase in build time relative to hull size, they take a serious investment.

Repairs are also difficult, especially with the large size of a base, and the repair system physics.
However, with a maintenance cost of 1/4 to 1/6 of a ship, they're quite doable.

Another concern is the fact that the enemy could just set a don't get hurt strategy, and escape from your bases. They'll take some losses, but not too much unless you have ships and fighters to chase them down with.