I'm assuming that you arn't doing any sanctioned racing here. Cut about 1/2 of the front windshield in directly in front of the engine. Cut most of the rear window out and cut out both side windows. Make sure you keep the corners rounded. A square inside corner will cause the body to tear when or eventually break when the body flexes. Also don't cut the vent holes too close to any other holes for glow plug or pull start.