forming a large diameter tube - rec.crafts.glass

Message from discussion forming a large diameter tube
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From: Permafacture <permafact...@gmail.com>
Newsgroups: rec.crafts.glass
Subject: forming a large diameter tube
Date: Mon, 8 Jun 2009 00:09:38 -0700 (PDT)
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I was thinking about how to slump a large diameter tube from a flat
plane of glass.  I have little experience with glass working and dont
know to what degree this is workable...

You'd take a piece of float glass, from like a window and slump it
over a ceramic tube you made/found as a form.  Put it in the kiln and
let it soften and after its really gooy pull it out for a second and
use poles to roll the hanging edges together.  The maybe flip it so
the seam is on top and put it back in the kiln.

?

Is this at all how you would form a large diameter tube from found
resources?
What size kiln do glass workers usually have; what is the widest sheet
i might be able to work?
can it be anealed in the same kiln it was slumped in?

thanks!