Bill,
I ground the "pocket" off so that the door was flat on the inside. Then I took some 90deg angle steel and made two brackets with holes in them for the pins.( I used 3/8" hitch pins also) I assembled the handle,brackets and pin (with washers between the handle and the brackets for spacers)and then glassed it into the door. It is much easier to drill and fiddle with the holes on the work bench instead of inside the door.
There didn't seem to be enough glass there to just mount the handle right to it.