as of right now i have my group in transit through the warp on a cobra class destroyer and i'm going to attack them with a Lady of the Voids but i don't know much about the ship. i've tried searching google and found some visuals for the exterior and i know they're about 1.5km long and such but what i'm wondering is what the interior layout should be like. mostly i want to know how many crew members there are and how much room the weapons systems and engines take up. i think the torpedo tubes take up a large portion of the front of the ship and i assume the engines are fairly large as well. just kind of need help visualizing the middle bits. thanks

This might not be a cobra but tells you the scale of it.
www.malleus.dk/Ordo/Rudderow.aspx

that is perfect! thank you so much. not a cobra but even better for what i've been using it for. thanks again

Glad to help

You reminded me that I saw this before:

http://www.darkreign40k.com/general-background/imperial-cobra-destroyer-ship-room-plan-released.html