Whats the typical cost for a custom interior

[socalfandabodys]

I have a 68 chevelle that I am almost down with. The car has a custom dash with a new black dash pad and a new dark grey essex carpet. I also dynamatted it and installed a new package tray. Thats all I have down to the interior. I have a set of new electric bucket seats in the front and the stock back seat and door panels. I would like to get the front seats,back seat,door panels, and headliner done. I would really like the interior to be done in a dark grey pleather with black stitching with some modern design. What do you think is a fair price. I just want to make sure I dont get ripped off.