Salvaging derelict ships

I feel like I'm here a lot lately.  My wife and I were talking about a special purpose ship for a salvage company.<br /><br />You couldn't simply throw some lines accross and tow it....or rather you *could* do that if you only cared about making the other ship move and you don't need to stop it from moving. (as an aside, getting an old ship moving on a trajectory and then cutting it free could make it a pretty handy weapon against a planet or station).<br /><br />She envisioned a piece of equipment that would be like a giant claw on the front end of your ship.  It would clamp onto the other ship's hull and thereby form a rigid connection.  Since this is a derelict I'm thinking about and we don't have to worry about damaging it we could probably have this claw thing dig right into the other ship.<br /><br />She also suggested carrying some extra engines in your hold and attaching them to the other ship....then you remote control it from your ship.  Maybe you could use the existing pylons after removing the non-functional engines, or since there's no one on board to kill with the radiation we could attach them directly to the ship's structure.<br /><br />If towing it away is impractical then your salvage operation basically has to be a big cargo ship with lots of work pods.  You would strip the other ship down and cut it into pieces small enough to fit in your hold.<br /><br />If anyone allows any kind of towing, how do you figure the maximum ADF/MR of the two ships together?  Add the two hull sizes together and go by that maybe?<br /><br />