I honestly have no idea how to actually do it, but I think that I'm at least going to try because I'd love seeing a Daedalus or Aurora class ships. I would love doing a Wraith ship as well but I think it's way out of my skill level.

I've got a Daedalus ship model on blender but have no idea on how to turn it into a working mod

There are detailed tutorials for this :
http://www.moddb.com/games/starpoint-gemini-warlords/tutorials

how large should the hull be?

From the ship tutorial :
As an introduction, here’s a quick recap of all of controllable ship classes in Starpoint Gemini Warlords, their default sizes and turret numbers.

Gunship Size: 3,5 Turrets: 2-4
Corvette Size: 7,0 Turrets: 4-6
Frigate Size: 20 Turrets: 8-10
Destroyer Size: 25 Turrets: 10-12
Cruiser Size: 40 Turrets: 13-16
Battleship Size: 65 Turrets: 17-21
Dreadnought Size: 110 Turrets: 28-32
Carrier Size: 150 Turrets: 24-28
Freighter Size: 15 Turrets: 2-3
Freightliner Size: 60 Turrets: 4-5

We tend to keep polycount up to around 30 000 tris, of course it all depends on the ship class itself, bigger the ship class, higher the polycount.

Daedalus is a Battlecruiser, so I take it that 40-45 is good enough.

Well, i must point out one huge problem with mods and ships - players are meant to make some progress and EVERY ship below dreadnought/carrier is either temporary, or permanently in hand of players. First means players will enjoy your mod for limited time. Second means they will suffer from great penalty for not using the strongest ship.
From what i know, size of BC304 class is approx. 220m lenght (which is less than destroyer class).
My suggestions:
1. Completely ignore real size, make a carrier from it (since it has 2 hangars of X302) and give 36 slots if possible ( http://stargate.wikia.com/wiki/BC-304 )
2. Make it a small destroyer, BUT boost its hull and shields. It would be great if it had its own railguns + asgard beams as missles (so they wont fire automatically) or even light weapons so you could boost their damage too, but that would be too much to ask :D

Well you can drop it as Cruiser since in SG their class is Battlecruiser, it wouldn't make it too big comparing to Carriers in this game as if you know the size comparation between it and Wraith hives.

Yeah, but as i said - as a cruiser it would be pretty weak (without new weapons or huge boost to hull and shields). Plus i am not sure if you can add hangars to cruiser.
Anyway, speaking about power i would prefer 2 slots in front (for beam weapons :D ) 6+6 on left and right side (for railguns) and maybe 4 more on back side also for railguns.
Shame we cant have weapons on bottom side of the ship (or can we?).

You can put weapons on the bottom. Formidable has them like that, she has 10 on the bottom, lol.

Also iirc, you can put as many weapons as you want on any ship when you mod it, you can make a cruiser with 50 turrets if you have where to place them lol. You just need to make proper power levels for that ship to sustain so many turrets.
But yes, I'd go with 5 front, 6 on left/right, 6 on back (4 on bottom, 2 on back of the ship but to count on back slot).
Hull: 35k or 40k
Shields: 30k (Asguardian shields ftw)
Shield refil:70
Shield down: 9
Battery power: 220
Battery refill: 15
Battery down: 6
Speed: 40
Cargo: 200
Heavies: 20 ammo per slot

2x hangar if possible

[img]http://i.imgur.com/lH6y6QJ.jpg[/img]

Some super fast paint editing about turret positions.

To me it seems like anything but "too weak", it could right on take on battleships and dreads/carriers. I'd do it with this ship!

Thank you for being patient, if I could send a picture I would but the modelling is done and the rest should be finished and published tomorrow, sorry for the wait!... If anyone is still in the discussion

Great news !

Originally posted by Evangelion:

[img]http://i.imgur.com/lH6y6QJ.jpg[/img]

Some super fast paint editing about turret positions. :D:

To me it seems like anything but "too weak", it could right on take on battleships and dreads/carriers. I'd do it with this ship! :D:

Yes please - people were complaining that we have useless small ships and game itself pushes you to buy big ones.
Mods that bring "overpowered small ships from another universes" could fix this with kinda friendly way :-)

That's awesome!
I'll message you about something. :D