Roll Cage/rear Seat

I thought about using a removable bar like on the door bars but was told that wasnt NHRA legal and the bar must be welded in. Since my daughter is young only 3 right now I figured she could craw over it for the next 5 years or so.

However your post got me to thinking if it would be NHRA legal to use a non traditional main hoop. One that protected the driver only and allowed rear passengers to enter and exit the rear seat from the passenger side.

Just thinking!