JD, if you want to save some money, go with the rigid, blue(and/or pink)insulation board from Home Depot or Lowes. Don't use the foil faced for it will soak up water much quicker. Home Depot also has sheets of FRP (used for bathtub walls)that you could use to finish off the inside. You'll want to use epoxy fillets in the adjoining corners to seal the joints etc. If you want higher efficiency, go with custom fabricated vacuum panels. The downside to these is the cost and if the seal if compromised, you lost all insulative value. Tom
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