Thanks for ideas .
My fist thought was to use the TA chassis because it is IFS and the whole front end can be removed from chassis and transplanted to a custom aluminum chassis one on the front and one on the back. Being independent all round with longer shocks and 2.2" wheels and tires should give me a few inches of wheel travel plus locking both diffs. Oviously nowhere near the travel of a true crawler but good enough for scale crawling and the like. Thats the plan anyway now just have to get hold of thew parts or butcher up two kits if I can get hold of them.