has anyone ever had any experience with these? You know the prefab panels that are like cold room material that they build extensions/ enclosures out of

Been considering adding a pool room etc and just asking around before I call the sales sharks

some eg's

http://ourhouse.ninemsn.com.au/ourho...ers/01/158.asp (price is very good!)

http://www.paneltech.com.au/modular.htm (toward the bottom)