Have laid out the screw spacing on the hoops so just set the canopy back in place and drilled pilot holed with a regular 3/32" drill bit. The trick it to visually line up normal to the surface, then visually center the drill on the hoop. Start the drill bit spinning before touching the polycarbonate and gently proceed, when through the plastic and the drill is cutting metal, increase pressure to keep the bit engaged in the metal.
Used air pressure to clear away the chips, through the hole.