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In article .com,
says...
i have a big ugly instrument idea that is unfolding into reality. it's
a 2' by 5' piece of stainless. bass hardware holds fat piano strings on
one side and on the other i want to weld stays to support a large
spring which i can hit with a metal rod. i will tune the strings to
resonate a certain chord when the spring is struck. i have some old
dimarzio bass pickups for under the strings but im wondering if a
contact mic would work on the sheet metal, or other ideas?

I have a suggestion for you that's completely off the wall:
Use autoharp-style keys and strings tuned chromatically. That
way, when you hit that spring, you can actually change the
chord that resonates afterwards.
--
---Mikhael...