Possibility you have an RUCC kit. Not sure why you deleted your posts and photos but if you are still around you might compare what you have to some of the details in this.
Cobra from the 1st state (pics and video))
I think their main frame rails were 2x4 inch which appeared light compared to other ladder chassis cars - but they used a backbone frame design which was very beefy and had good cowl and door structure. Seems that I remember from your deleted pictures that they have the same wide door threshold and the same hood latch detail. I could be wrong.