roll cage?
Cut holes on the floor slide the hoop down through the holes so you can weld the top of the bars in repeat for all bars, then weld 6x6 plates over the holes and weld bottom of bars to plates.
Then do the front bars through the dash and dash bar and windshield bar across the top, "tack" those in good, then break the tacks on the main hoop, lower the whole front section down then finish weld that.
Then tilt it forward and retack on the main hoop and then fit and weld the rest in.








