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David
I talked to a local ceramics shop kiln and heating element guru and 7.5ohms is what he recommended for the space I have.
Euclids.com has wire and I found a table of kanthal a1 resistance per foot from 0 up to 30 gauge.
I wrapped my wire around a quarter inch rod if you go real slow and have some help( I didn't) clamp the wire to the rod with vice grips and leave them on the end until your finished. I supported both ends of my rod in a hole drilled in a couple pieces of wood fastened to my bench. Then just stretched it to fit in the length of groove I had , I think I have 64 inches. So your 60 to 62 would be about right.
Try dckives.blogspot.com find the knife making onto box click on that then find the heat treat oven project. I got some of my info from there.
I hope this answered some of your questions and hopefully it wasn't to confusing.
Sam
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