Update - I've got the GTExD in-game and working like a dream.

Now all I need to do is convince someone to add the docking paths and the like. Turrets are already complete - don't worry.

I've equipped the GTExD with one LRBGreen and 6 BGreens. 3 of each kind of flak, 6 AAAf, and 3 FighterKillers.

I set up a test mission with the thing attached to an Arcadia, and a Demon jumping in 10km away. When it arrives it launches 2 fighter wings - one of Nahemas and another of Mara's guarding them - and proceeds to cruise to firing range. Well, the result is that the only ships left at the end - without my intervention at all - are usually me and the Arcadia.

The GTExD and the Demon are near-perfect matches for each other.

Anyways, lemme know if you want to do the paths and dockpoints. I'd like paths for the turrets as well, but there are only 25 turrets all in all.
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Sandvich Bar, the CapShip Turret Upgrade, the Complete FS2 Ship List and the System Backgrounds List (all available from the site)