JasonRocZ has modeled several Steltek ships for aspiring modders to use. The egg-shaped Drone and Scout are based off the ships in Privateer, and the Fighter is an extrapolation of the derelict we see in the game. All three are now available in 3DS format (700 kilobytes), and they look pretty sharp. As an extra bonus, the Scout is also available as an insertable ship into Secret Ops. Grab that one here (90 k) and direct any questions to Crius.net.
It took me quite a few hours to get it where it is. As far as the poly count is concerned, I think the Drone is at 4000, the Scout 2200 and the Fighter at like 12000. For anyone wondering, these will not be used in the WC:CD Mod.