I will agree with techinspector1 in asmuch the seatbelt should be mounted correctly for not only safety but also comfort. I find it difficult to understand why some people believe that in a crash, the body will seperate from the frame... If constructed correctly no car should fall apart like that... When building my Bucket I constructed a special crossmember with outriggers solely to mount seatbelts that when the body is fitted the seatbelt bolts pass through the floor into the crossmember mounts. The should height seatbelt mounts are welded into the heavy 3mm wall rollbar that is bolted directly to the chassis/frame. I personally find that the seatbelts in my bucket are far more comfortable than the stock belts in my BMW coupe, as they don't slide up my shoulder and cut into my neck.. As tech says..... use heaps of bolts / fasteners to attach that body....