You can also use a reciprocating saw - with a steel cutting blade - it's a bit clumsy but you can do it... I like Ned's idea of using a 'body saw' - the small air driven body saws are exceptionally handy! Be prepared to use LOTS of blades... these little buggers can really go through them.
I also use a variable speed jig saw with bi-metal cutting blades in them for some work...
Watch out for those BRACES underneath -- mark them if you're cutting from the top -- you'll want to drill out the spot welds in them and keep 'em in place...
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