Hi Milky
Best idea NOT to use fibre glass insulation around your tank, as would not be good for your snake. Get yourself a thermometer and keep your little guy at 30c at the hot end with either a heat mat or heat globe and i would reduce the amount of ventilation you have with an ajustable cover or something and connect your heat source to a thermastat so you have automatic regulation of temps.Move your tank away from the door as drafts can make temps irregular in the tank and drafts are'nt that good for your little guy to be expossed to,feed the little every 7 days with appropriate sized meals and start recording all meals and sheds in a record book so you can see his progress.
That should keep you going for a while.
Congo