id buy a straight chassis car, and swap all the good bits over. you cant really see how bad the damage to the chassis is at all from your pic. but if its rooted id buy another ute and swap all the parts over if that one is in any good condition.
it doesnt even look loike chassis damage, get some petter photos (underneith car and what not) but id say it would be quite expencive, where i work we wrote off a vx with less damage than that
Ball park figure for a very vague photo, 4500 including a respray if you know somebody. It doesnt look like the rails are damaged from the pic though so you might be lucky