I have drilled / cut may holes in different Scamps. The shell thickness usually varies between 1/8" and 1/4". I did cut an access hole for the bottom of a closet in a S-13 and found the glass thickness near the door to better than 1/2". It appears they built up the glass to beef up the door frame.
shells are composed of chopped glass and resin. Scamp
does glass in a piece of wood in the rear wall where the table mounts to. At this point with the glass and wood the wall would be over an inch thick.
Do you have a picture of where you drilled the hole?