Re: worst day ever...truck wrecked
Well im glad you werent hurt, and glad you have decided to fix the truck. Id say that youll probably be better off getting a new frame, as depending on how bad the damage is it can cost more on a frame puller then it does to get a new frame and start fresh, then you can work on getting the back half done before really tearing into the truck.
As for the VIN, i believe when you remove the dash the vin plate comes with it, if not it is just riveted to the body, and can be easily transferred, and as long as you plan to keep the truck the legality of it is prety mute. But when it comes time to sell it, just be sure to give the new owner all the info so they know what they are buying.
Also if you do swap cabs, be sure to remove the stock console mounts welded to the floor of your cab as no other S10 will have the right mounts in it.
Good luck on the rebuild, and please post some pics.