so no particle board.. what about hardwood plywood? like birch? same concept in between the layers with the formaldehyde? or is it something else they use. sorry for all the questions. i just want to make a safe enclosure. could an adhesive vinyl roll be use to glue on wood or would chemicals from the glue be just as bad? figured it might be good or should i just get some wood and put minwax or something on it?