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     Re cutting out the SS firewall.  All I did was carefully
draw out the firewall outline on a cardboard sheet, cut the
cardboard out, check the cardboard outline for fit on the
airplane, transfer the outline to the SS sheet, and cut it out
with a good pair of tin snips.  A few strategically drilled holes
makes for easier cutting on the tighter radii.  It might have
taken me 20 minutes and made my right hand a little tired,
but that was all there was to it.  If you have access to a
grinding wheel or have one for a hand held drill you can
easily make final adjustments or do as I did, just trim with
the snips.  Avoid dull snips, obviously.  I used the same
technique for the fiberfrax insulation.  A fresh set of Wiss
snips goes for $16 -18 in the Wicks catalog, but I've seen
the same snips in local hardware stores for around the same
price.  Good Luck!

Cheers,
Pete