[sdiy] UA726 clone possible?

[Tom Bugs]

Sorry, please reply to this one so it has a new thread title:::

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I wondered before why no-one seems to have done a clone of the ua726.

Doesn't *SEEM* all that complex?!
A nice matched pair (eg LS318) is the main core.
6 transistors (I presume general purpose?), 2 x 6V2 zeners and 6 
standard resistors.. - those parts being for the heating element.

Get the pin placement right, encapsulate it in goo..

What am I wrong on?

[I don't want to fully take on such a project, though could potentially 
do a design up for initial testing with a view to someone running a 
production in a friendly open-source-ish manner]

Tom