YO" FELLARS--CHECK THIS OUT !!!!
If it works, it could be very handy !!!
http://www.gold-rus.com/Gold/Microwave-Gold-Kiln-Kit.html"
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Here is a couple of explanatory links, if your interested?
http://goldsucker.com/blog/?p=26===============================================
http://home.c2i.net/metaphor/mvpage.html===============================================
NOTE: As to the Kilns fiber insulation material.
There is available in N.Z. a building block called ? (YTONG) or something like that.
These blocks are very "Light", and also capable of withstanding a hell of a temperature, and, they can be cut with an ordinary "HANDSAW".
Might just save a couple of bucks?
"KIWIJW" should be able to help with the the correct name of the blocks, and also who supplys them ?.
Have "Fun"
Cheers===Colin.